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Doctor insights on: How Do I Tell What Is Causing My Allergic Reaction Rash

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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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Dr. John Chiu
2,592 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 can you tell if a rash is caused by an allergic reaction or something else?

How can you tell if a rash is caused by an allergic reaction or something else?

Can't: There's an old saying in dermatology: you can't diagnosis a rash over the phone. I even get confused after seeing some rashes. Generally, allergic rashes are welts but some allergic rashes are small red dots. Best to see your dermatologist. ...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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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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Is aloe okay or helpful to put on a skin rash caused by an allergic reaction?

Is aloe okay or helpful to put on a skin rash caused by an allergic reaction?

Yes; try cortizone (hydrocortisone): Aloe is generally very soothing to most rashes. If your rash is due to an allergic reaction, try otc hydrocortizone cream a few times a day as needed to alleviate the rash and any itching. You can also soak in an aveeno oatmeal bath. Oral Benadryl (diphenhydramine) can be helpful if itching. If the rash is getting worse or seems painful, contact your doctor to take a look. ...Read more

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I have dark spots, red patches , itchy painful skin rash. The hospital said it was a allergic reaction but couldn't figure out what caused it.

Allergic rash: See your dermatologist for evaluation and treatment of your rash. There are treatments that will work even if you don't know the cause of the rash. It will be important to be sure it is not a reaction to a medication. Allergic reactions can come from inside the body or from external contact agents. If your dermatologist suspects an external contact agent they can perform patch tests to look for. ...Read more

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Could red wine like syrah or shiraz and/or blueberries suddenly cause brow & lip swelling then lip rash afterwards, ie allergic reaction?

Could red wine like syrah or shiraz and/or blueberries suddenly cause brow & lip swelling then lip rash afterwards, ie allergic reaction?

Possibly: It's common to be allergic to these things, and it would be best for you to be evaluated in person by your family doctor (or a dermatologist or allergist). ...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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How can you tell the difference between a rash or an allergic reaction?

How can you tell the difference between a rash or an allergic reaction?

Rash vs allergy: Reactions to foods, medications, insect (bee) stings often are generalized (all over), and usually are hives. Viruses and bacteria can trigger rashes that are typical for the infection (for ex., scarlet fever), but also hives. Trouble comes when on medications for an infection, and a rash or hive breaks out. Seek an experienced provider, allergist or dermatologist. ...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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How can you tell the difference between a heat rash and an allergic reaction?

How can you tell the difference between a heat rash and an allergic reaction?

Rash v Allergies: Heat rash develops when your sweat ducts become blocked and perspiration is trapped under your skin. Symptoms range from superficial blisters to deep, red lumps. Some forms of heat rash can be intensely itchy or cause a prickly feeling. Heat rash usually goes away on its own. Allergic reactions go away with removal of the allergen and return when re-introduced. ...Read more

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What to do if i can't tell if I have heat rash or an allergic reaction. Help!?

What to do if i can't tell if I have heat rash or an allergic reaction. Help!?

Better description: A heat rash is an unspecific term but presumably related to heat. How long does it stay with you after the exposure and whether it itches or not is another issue we need to know. Also we need to know the time of onset of the rash after sun exposure. In general , an allergic reaction is often accompanied by itching. Regardless, the prudent answer is avoid the exposure. Sunscreen tried yet? ...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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Can someone tell me details about the rash associated with a severe allergic reaction to itraconazole? Please! i'm clawing my flesh off!

Can someone tell me details about the rash associated with a severe allergic reaction to itraconazole? Please! i'm clawing my flesh off!

CAN HAPPEN NEEDS RX: Yes you can develop rash due to allrgy to itraconazole and if you have developed this allergic rash it will need to be treated with antihistamines and if severe short course of steroids consult your doctor and get treated or if you can not wait go to er. ...Read more

Dr. John Chiu
1,035 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
2,632 doctors shared insights

Skin 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