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Doctor insights on: How Can You Tell If A Rash Is Caused By An Allergic Reaction Or Something Else

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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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Dr. Cornelia Franz
1,059 doctors shared insights

Rash (Definition)

Most bumps and blotches on a newborn baby are harmless and clear up by themselves. By far the most common skin problem in infants is diaper rash. Diaper rash is an irritation of the skin caused by dampness, urine, or feces. Most babies who wear diapers will have some type of diaper rash. However, there are other skin disorders that can cause rashes. These are usually not serious unless ...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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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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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 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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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 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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Dr. John Chiu
2,491 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


Dr. John Chiu
1,005 doctors shared insights

Allergic Reaction (Definition)

Allergic reactions are 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