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Doctor insights on: Why Does An Allergic Reaction Turn Into A Rash

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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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Dr. John Chiu
2,649 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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Can a child overgrow an allergy to an insect venom? If fire ant causes rashes, and swollen ear does it mean a child has severe allergy?

Can a child overgrow an allergy to an insect venom? If fire ant causes rashes, and swollen ear does it mean a child has severe allergy?

How old is ur child?: The reaction you described differs if before or after 5 years of age, please avoid exposure, keep an epinephrine pen and antihistaminic handy, check with an allergist/immunologist, might need desensitization according to clinical judgement after history and examination. Check aaaai.org or acaai.org for an allergist in your area, best wishes ...Read more

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What does an allergic reaction to neosporin look like?

What does an allergic reaction to neosporin look like?

Itchy rash typically: The neomycin component of neosporin is a well known and fairly common trigger of allergic contact dermatitis. The rash is itchy, red and occurs where the medication came into contact with the skin. The mechanism is similar to poison ivy type rash. An allergy skin test is available if the diagnosis is in question. ...Read more

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What does an allergic reaction to antibiotics look like?

What does an allergic reaction to antibiotics look like?

Depends: It depends on the nature of the immune response. Allergic antibody (IgE) mediated reactions occur rapidly after ingestion and can involve hives, skin swelling, wheezing, shortness of breath, nausea/vomitting, diarrhea, dizziness, confusion, palpitations, loss of consciousness and even death. A delayed reaction can occur after days on the medicine and would have different constellation of symptom ...Read more

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What does a strawberry allergy look like in an allergic person?

What does a strawberry allergy look like in an allergic person?

Same as other foods: Food allergy usually starts within 30 min. And involves some or all of following: itchy/swollen lips/mouth/throat, nausea, vomitting, abdominal cramps, diarrhea, flushing, itchy skin, hives, chest tightness, wheezing, runny/stuffy nose, itchy/watery eyes, lightheadedness/low bp. It is rare to have a single symptom except itchy mouth and symptoms resolve within 24 hours. Allergic reactions to fo. ...Read more

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What does a rash from a shellfish allergy look like?

What does a rash from a shellfish allergy look like?

Hives, usually: Most rash from shellfish allergy looks like hives (urticaria) and/or swelling of the eyes, lips and hands (angioedema). A few people with atopic eczema who are shellfish sensitive might get worsening of their eczema. People who process shellfish (like fishermen or cannery workers) might get an eczema-like rash on their hands and skin where they contact the shellfish. ...Read more

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What would the rash look like if you had an allergic reaction to brometane?

What would the rash look like if you had an allergic reaction to brometane?

Varies: If you think you having an allergic reaction to any drug contact the doctor who prescribed the drug if you can stop the drug .Discuss whether you can use another drug which will not give you possible reaction. If the drug is essential it can be reintroduced after the rash resolves only under direct medical supervision. It is preferable to avoid drugs which cause allergic reactions. ...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 come after taking a painkiller, my skin starts to itch? Is this an allergic reaction?

How come after taking a painkiller, my skin starts to itch? Is this an allergic reaction?

Probably not.: If you are referring to an opiate pain killer like codeine, hydrocodone, morphine, etc. The itching likely represents a release of histamine -- the chemical that causes allergic reactions. This is a function of the medication itself. Histamine is also released in allergic reactions so the confusion is understandable. If the painkiller is Ibuprofen or something similar, it could be an allergy. ...Read more

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Could an allergy to peanuts cause a rash that looks like mosquitoe bites?

Could an allergy to peanuts cause a rash that looks like mosquitoe bites?

Yes: Peanut allergy can manifest itself as hives (urticaria) commonly. Hives look and feel like mosquito bites--they are raised, red, itchy, round to oval and can be of various sizes, scattered on the body. Hives usually wax and wane and the skin appears normal after they resolve. If the rash occurred after eating peanut, see an allergist for confirmation and a treatment plan. ...Read more

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Is it possible to get an anaphylactic reaction from poison ivy or just rashes?

Is it possible to get an anaphylactic reaction from poison ivy or just rashes?

No anaphylaxis: The reaction (rash) that one gets from exposure to poison ivy is mediated by t cells, not immunoglobulin e (ige). Ige is the antibody that mediates anaphylactic reactions. Therefore, an anaphylactic reaction to poison ivy is very unlikely. ...Read more

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My armpits itch. Is this due to an allergic reaction

My armpits itch. Is this due to an allergic reaction

Possilbly: Itching of the skin is a reaction due to some type of irritation. This irritation could be due to allergies, infections, insect bites, etc. Best to see your family doctor or dermatologist for an evaluation. ...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 dermographism caused by an allergy reaction? For example, I just randomly scratched & lines started to appear, is it an allergy reaction?

Is dermographism caused by an allergy reaction? For example, I just randomly scratched & lines started to appear, is it an allergy reaction?

Touch Urticaria: Touch urticaria is thought to run in families, and it is caused by a release of histamine, so in a sense is an "allergic " phenomenon. Antihistamines are the mainstay of treatment and may be used as needed. ...Read more

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How does your body have an allergic reaction?

How does your body have an allergic reaction?

IgE antibody: When the body is exposed to an allergen (once or more likely many times), the body can respond by making the antibody ige. On re-exposure, the ige that is attached to mast cells present in the nose, skin, and lungs, degranulates and releases chemical mediators like histamine that leads to the symptoms of an allergic reaction like sneezing, itching, congestion, and swelling. ...Read more

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What does a allergic reaction of a mosquito bite look like?

What does a allergic reaction of a mosquito bite look like?

Depends: If your talking about the mosquito getting a rash after he bites you its hard to see. Look through a magnifying glass at his chest and proboscus area. Usually they fly away before you can find a tiny magnifying glass. As for the situation of a rash on you from the mosquito. It looks red, bumpy and is itchy. ...Read more

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What does the hospital do when someone has an anaphylatic allergic reaction?

Lot of things: I.V right away, , epipen, (epinephrine) benadyl i.V , tagamet IV o2, keep airways open keep eye on b.P . Treat you total with expert team keep you their til fit to leave. ...Read more

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What does it mean when a baby's skin breaks out in small red bumps all over? Kinda like an allergic reaction.

Infantile eczema: Allergies, rule out change in detergents or food consumption.Baby eczema (infant eczema or atopic dermatitis) appears in about 10% to15% of children. It shows up as patches of red skin.Skin is almost always itchy, dry, and rough. Dry skin, irritants, and allergens causes.Usually outgrow condition. Treatment with daily warm baths, not hot, no bubble baths, soaps, use moisturizer on skin after bath. ...Read more

Dr. John Chiu
1,046 doctors shared insights

Allergic Reaction (Definition)

A sensitivity to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, or gastrointestinal tract. They can be breathed into the ...Read more


Dr. John Chiu
2,687 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