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Doctor insights on: Allergic Reaction Rash

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Dr. John Chiu
2,638 Doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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How do I tell what is causing my allergic reaction rash?

How do I tell what is causing my allergic reaction rash?

Timing: It depends on the timing. The contact with the allergens, either through skin or oral, usually happens days or weeks ago. Person's recall history is crucial. Tests are unreliable or not available. ...Read more

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How do you know you what type of allergic reaction rash you got?

How do you know you what type of allergic reaction rash you got?

Rash trigger: Dear CDean,

It would depend on what triggered the rash and what it looks like and your symptoms. Best to have a health care professional see the rash to determine the type. ...Read more

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How long does it usually take an allergic reaction rash to go away?

How long does it usually take an allergic reaction rash to go away?

Variable: Hives or urticaria may wax and wane then resolve within a day or 2 after ingestion or contact with a food allergen. However, poison ivy or nickel allergic contact dermatitis may take 4-6 weeks to eventually resolve. The time to resolution is also impacted by what medications are taken such as oral corticosteroids such as prednisone, which can decrease the time significantly. ...Read more

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How long does an allergic reaction rash from echinacea last?

How long does an allergic reaction rash from echinacea last?

A few days: Rashes from something you ingest typically last for just a few days or less. The bigger question is what really caused the rash. People break out in rashes from time to time, and it's just human nature to blame the rash on something we ate in the last few hours. If the rash is continuing for more than a week, it probably has nothing to do with the echinacea; you should see your pcp to check it out. ...Read more

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How to get rid of an allergic reaction rash?

How to get rid of an allergic reaction rash?

Allergic rash: Usually it takes prescription medications, such as topical and sometimes oral steroids. ...Read more

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Why is my skin gray after an allergic reaction rash?

Why is my skin gray after an allergic reaction rash?

Trauma: Need to know what is the normal color of your skin. The greyish coloration is likely from the residual of the allergic inflammation or from scratching and should subside within weeks if the allergic reaction was the cause. I assume that this is a case of contact allergy. ...Read more

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How to tell a heat rash from an allergic reaction rash?

How to tell a heat rash from an allergic reaction rash?

More localized: Allergic rash often hive or welt like may be more diffus, heat rash in warmest areas, groin, axilla, flexor creases. ...Read more

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Are there sure ways to get rid of this allergic reaction rash from a pill?

Are there sure ways to get rid of this allergic reaction rash from a pill?

Time and meds: Most medication reactions will begin to improve within 48 hours after stopping the medication. To ease the symptoms of a drug allergic reaction, antihistamines such as zyrtec, Claritin (loratadine) or Allegra can help. On occasion oral steroids like Prednisone are needed. If the rash is blisters or progressing, then a doctor's visit is important for further evaluation and treatment. ...Read more

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How long will an allergic reaction rash from keflex last? I was on the pills for 13 days before the dr finally said it was an allergic reaction

How long will an allergic reaction rash from keflex last? I was on the pills for 13 days before the dr finally said it was an allergic reaction

Days to weeks: Can last days to weeks. Itching usually goes away within a week. But lesions from rash can last several weeks before they completely fade. ...Read more

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Benadryl (diphenhydramine) tabs take about 1 hour to start working to treat my allergic reaction (rash) Would Benadryl (diphenhydramine) IM be a faster alternative? Can I obtain an RX?

Benadryl (diphenhydramine) tabs take about 1 hour to start working to treat my allergic reaction (rash) Would Benadryl (diphenhydramine) IM be a faster alternative? Can I obtain an RX?

Depends: Benadryl (diphenhydramine) may help hives but not a rash which has lasted more than 24 hrs. IM Benadryl (diphenhydramine) gives you perhaps a 30-minute head start vs oral = not worth the cost or hassle. If you have throat swelling, you may need adrenaline and an allergy consult since this can be life-threatening. ...Read more

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Have allergic reaction rash was given prednisone to take 60mg a day for 3 days, this seems like a lot. Do I need it or will they go away on their own?

High dose: There is no one correct dose for oral steroids, but most clinicians would dose according to the severity of the allergy or that particular person's previous response to oral steroids. 60 mg of prednisone is a high dose for some rashes such as hives but may be necessary for generalized allergic reaction like anaphylaxis. IDouble check with doctor to make sure that is the correct dose. ...Read more

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How can you get rid of an allergic reaction rash that's on my face and neck? Help?

How can you get rid of an allergic reaction rash that's on my face and neck? Help?

Allergic reaction: If it is true allergic reaction, then avoidance of the allergen will curb the reaction hopefully. Using an anti-allergy preparation such as Benadryl (diphenhydramine) at night might help. Hydrocortisone cream once to twice daily on the affected areas excluding eyes may be tried for no longer than 2 weeks at a time. If those fail, definitely see a doc. ...Read more

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Possible to have latex condom allergic reaction (rash/dry/slight itch) 12-24 hours after sex every time, if no reaction after masturbation w condom b4?

Possible to have latex condom allergic reaction (rash/dry/slight itch) 12-24 hours after sex every time, if no reaction after masturbation w condom b4?

Latex allergy: You are exhibiting symptoms of latex allergy, and yes they can be secondary to condom use. You should use sheep skin condoms to avoid contact with latex, but careful they break easily. ...Read more

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Are there any over-the-counter products I could take to help with an allergic reaction (rash of red itchy red bumps all over my body?

Are there any over-the-counter products I could take to help with an allergic reaction (rash of red itchy red bumps all over my body?

Antihistamines: Depending on what the rash is from, you could try antihistamines like Diphenhydramine (benadryl). If you are having any respiratory symptoms like shortness of breath or throat swelling, you should be evaluated in the er. ...Read more

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Have been taking macropen for 6 days and now have a fuzzy feeling on tongue. Is this possibly an allergic reaction. No rash or other signs/. Thank you?

Have been taking macropen for 6 days and now have a fuzzy feeling on tongue. Is this possibly an allergic reaction. No rash or other signs/. Thank you?

Fuzzy tongue: No that's a FUNGAL over growth on the tongue from knocking out all the bacterial commensals in the mouth from 6 days of PEN. If you have normal T cells and if the overgrowth not too bad you can do nothing AND as the bact come back the fungi will go down. You can also get ANY anti-fungal OTC vaginal supp and suck one a day for 5 days and that will nail it too. Next time take antifungal Rx simultan ...Read more

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How can I tell the difference between a rash caused by allergic reaction and rash caused by flesh eating bacteria?

How can I tell the difference between a rash caused by allergic reaction and rash caused by flesh eating bacteria?

Red versus dead: An allergic reaction is manifested by a raised red firm sometimes itchy but usually limited area whereas flesh eating bacteria create a rapidly spreading area of redness with fever and pain. The skin may blisters itch fluid or air bubbles or become grey/black. ...Read more

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I wotre a knee brace that was too tight. On a knee that was already having an allergic reaction. The rash has spread all over my body? Help?

I wotre a knee brace that was too tight. On a knee that was already having an allergic reaction. The rash has spread all over my body? Help?

Benadryl (diphenhydramine) and call: Use Benadryl (diphenhydramine) to help with the rash symptoms for the here and now. Stop using the brace and call your physician. ...Read more

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My son had an allergic reaction (severe rash & hives) to a supprelin implant. Is it likely he will react to lupron-depot too?

My son had an allergic reaction (severe rash & hives) to a supprelin implant. Is it likely he will react to lupron-depot too?

Maybe...but unsure.: Supprelin la (histrelin) is a Histrelin Acetate implant; whereas Lupron depot is a Leuprolide Acetate suspension. Obviously there is worthwhile concern on your part about this alternative therapy for central precocious puberty in that both medications act to suppress development of puberty artificially. Regardless, the best source of information on this matter is your son's endocrinologist. Contact her today. ...Read more

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I've had an allergic reaction (skin rash) to a dose increase of sertraline. The rash is on my face, neck, chest, back and arms. I took a full 25 mg dose 1x and woke up with a slight rash on my face. Took a 2nd 25 mg dose and the rash is now everywhere

I've had an allergic reaction (skin rash) to a dose increase of sertraline. The rash is on my face, neck, chest, back and arms. I took a full 25 mg dose 1x and woke up with a slight rash on my face. Took a 2nd 25 mg dose and the rash is now everywhere

See MD: Contact your prescribing doctor without delay for advice. Rash from sertraline has been reported, but is not common. Doctor needs to see your rash and advise. If you can't reach your doctor, go to urgent care or ED for proper diagnosis and guidance. Hope you feel better soon. ...Read more

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Could a manicure cause itching in throat and all over body- no rash. Allergic reaction? No rash or redness at the nails or hands or feet though.

Could a manicure cause itching in throat and all over body- no rash. Allergic reaction? No rash or redness at the nails or hands or feet though.

Real or not real?: I wonder if you have inhaled the dust from the filing of the nails. This dust can be dangerous. Consider changing salon to one with good ventilation and extraction system. ...Read more

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My wife seems to be having a bad allergic reaction. She has rashes all over her body and is itching badly. What is the best way to alleviate this?

My wife seems to be having a bad allergic reaction. She has rashes all over her body and is itching badly. What is the best way to alleviate this?

Stop the offending: Cause if known. Also reasonable to take short acting antihistamines like Benadryl (diphenhydramine) or longer acting ones like Claritin or Zyrtec. If the rash is severe enough and/or the itching is not alleviated than over the counter steroid creams may be beneficial. Of course if symptoms do not improve or worsen a trip to the doctor may be in order for a definitive diagnosis and/or stronger prescriptions. ...Read more

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Could an allergic reaction cause a rash all over my body?

Could an allergic reaction cause a rash all over my body?

Absolutely.: Certain rashes are definitely not related to allergies; diagnosis starts with the appearance. This is where a knowledgeable, experienced diagnostician is key. Many viruses do, too, and some are quite itchy. So do medications, too, and continuing to take the drug may be risky. Better get checked out. ...Read more

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How can you tell if your baby has an allergic reaction to diaper rash cream?

How can you tell if your baby has an allergic reaction to diaper rash cream?

Patch test: You can check just about any product for skin sensitivity/reaction/allergy by doing a patch test. If you place a dab of the material on the fabric part of a bandaid & place it in a location where it won't be disturbed. (back of a baby or underarm of older kid) leave it on overnight, if no reaction within that time frame the product is likely safe to use over long periods. ...Read more

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My dad has a rash all over his body he has tried allergex thinking it was an allergic reaction but the rash became worse, what could this be?

My dad has a rash all over his body he has tried allergex thinking it was an allergic reaction but the rash became worse, what could this be?

More details needed.: We need to know if the rash itches, how long has he had it, and how long does each individual lesion stay. But there are many potential causes such as a drug reaction. ...Read more

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Missed 2 days of my liquid amoxicillin for strep. Just took a dose. Would an allergic reaction such as rash or anaphylaxis happen? I did 5 days of it.

Missed 2 days of my liquid amoxicillin for strep. Just took a dose. Would an allergic reaction such as rash or anaphylaxis happen? I did 5 days of it.

Unlikely: To have an allergic reaction or anaphylaxis. If you were allergic in this way you would most likely have the reaction almost immediately with the first dose, not after 5 days. You should try to be completely compliant with antibiotic therapy especially when treating Strep. ...Read more

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In may. After amox. Itchy macularpap rash. Drs. Believe allergic reaction. Now where rash was is lighter spots. Leprosy? Hiv? Cancer? No longer itch

In may. After amox. Itchy macularpap rash. Drs. Believe allergic reaction. Now where rash was is lighter spots. Leprosy? Hiv? Cancer? No longer itch

None: Post allergic reaction, sometimes hyper- pigmented spots or de- pigmented spots are left--- that's just normal course of recovery from the reaction. These spots- sometimes take upto six months to fade away. ...Read more

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Why does an allergic reaction turn into a rash?

Why does an allergic reaction turn into a rash?

Usually histamine: Histamine causes redness, itching, pain, swelling, the common skin manifestations of an "allergic reaction". ...Read more

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Itchy, swollen gauge and skin rash - allergic reaction, should I be concerned?

Sure: Consider taking an antihistamine and if this does not help see a doctor. You may need a prescription. Use aveeno (oatmeal) bath oil on a washcloth with tepid water in your shower and put witch hazel on the itching area to slow it down. Use sarna lotion for the itch. ...Read more

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I need to know if this rash is a heat rash, allergic reaction or something else since it happened after I had my blood drawn today?

I need to know if this rash is a heat rash, allergic reaction or something else since it happened after I had my blood drawn today?

Need more info: Where is the rash? What does it look like?
If the rash is only at the site near the needle puncture, you may be allergic to the solution applied to disinfect the skin or to the bandaid that was applied after the needle puncture. If the rash is elsewhere, then it is not likely to be related to having blood drawn. ...Read more

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I've been taking 2 amoxicillin pills everyday for 5 days and had an allergic reaction. I have a rash all over my body, how long will this last?

I've been taking 2 amoxicillin pills everyday for 5 days and had an allergic reaction. I have a rash all over my body, how long will this last?

Days: Typically drug allergic skin reactions such as hives or pinpoint rashes will begin to improve within 2 days of stopping the drug. The rash will then gradually improve over the next several days. With treatment, the course may be shortened and symptoms milder. Be sure to let your doctor know what is happening! ...Read more

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How long until I see the effects of prednisone for an allergic reaction to cephalexin, severe rash?

How long until I see the effects of prednisone for an allergic reaction to cephalexin, severe rash?

A few days: You should start seeing improvement hopefully within a few days. Using a topical steroid cream with the oral steroid can also help quicken recovery. If it is not improving, let your physician know. ...Read more

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Re: severe poison ivy rash/allergic reaction of skin - How long does it usually take for a Kenalog shot to kick in and symptoms to start subsiding?

Re: severe poison ivy rash/allergic reaction of skin - How long does it usually take for a Kenalog shot to kick in and symptoms to start subsiding?

Define "kick in": You can usually expect a reduction in the intensity of itching within 24 hrs. Swelling may take a bit longer. The skin rash will take a week or two to fade whether you have the shot or not. There are products like IVYDRY or Benadryl cream that seem to help some. I avoid calamine lotion as too drying and stinky. ...Read more

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How long after taking Azithromycin would an allergic reaction happen? Developed a rash on elbows day after I finished the antibiotics. Related?

How long after taking Azithromycin would an allergic reaction happen? Developed a rash on elbows day after I finished the antibiotics. Related?

Unrelated: Drug rashes can appear within minutes to hours, a day is kind of a long period. If the rash is spreading or bothersome, call or see your doctor ...Read more

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The pharmacist gave me a generic facial cream instead of the brand name I needed. Having allergic reaction on my face. Rash, itch, peeling, burn.????

The pharmacist gave me a generic facial cream instead of the brand name I needed. Having allergic reaction on my face. Rash, itch, peeling, burn.????

Stop: Topical hydrocortisone cream may help but if problem is severe talk to your doctor to get something more potent. Since generic is similar to brand based on only the active ingredient, the rest may be quite different. You must have become allergic to one or more of the ingredients in the makeup of the cream or have newly become sensitized to the active ingredient itself, brand or otherwise. ...Read more

Dr. John Chiu
1,044 Doctors shared insights

Allergic Reaction (Definition)

Sensitivities to substances, called allergens, that come into contact with the skin, nose, eyes, respiratory tract, and gastrointestinal tract. They can be inhaled into the ...Read more


Dr. John Chiu
2,673 Doctors shared insights

Rash (Definition)

A skin rash is a symptom in which a person has changes on part or all of his skin, such as color changes, bumps, blisters, oozing, peeling, ...Read more