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Doctor insights on: How To Tell The Difference Between A Heat Rash An Allergic Reaction

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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. 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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What is the difference between a heat rash and an allergic reaction?

What is the difference between a heat rash and an allergic reaction?

Caused by heat: Heat rash is caused by heat. It has a variety of presentations, most common being red bumps with small vesicles that are easily ruptured. Contact dermatitis is extremely itchy and is localized to areas that are exposed to the offending agent. It is always red and swollen and sometimes has small vesicles with the affected area. ...Read more

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Difference between heat rash and allergic reaction on face?

Difference between heat rash and allergic reaction on face?

rash: Heat rash usually causes overall redness and small bumps. Allergic reaction causes hives and skin swelling. Don't self diagnose, see a doctor. ...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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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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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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July i noticed my skin breaking out, heat rash, was going away now seems to be back along with whiteheads on face.Looks bad like allergic reaction, help?

July i noticed my skin breaking out, heat rash, was going away now seems to be back along with whiteheads on face.Looks bad like allergic reaction, help?

May not be allergy: You don't really describe the original rash and don't mention itching. You also have other issues. Miralax (polyethylene glycol) may cause abdominal pain and diarrhea. Try an anti-histamine such as fexofenadine (allegra) or Loratadine (claritin, alavert). I don't suggest Cetirizine (zyrtec) or Diphenhydramine (benadryl), because they may worsen constipation. If no better in 2 days, see your physician. ...Read more

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How can I tell the difference between heat rash, and a reaction to taking Aleve (naproxen). Do either require medical attention?

How can I tell the difference between heat rash, and a reaction to taking Aleve (naproxen). Do either require medical attention?

Not enough info: As to skin rashes, seeing IS believing. I recommend that, if you can't get in to see your own doctor, you go to an urgent care center for evaluation. Alternatively, you could do a Virtual Consult with one of our doctors. You would need to do an audiovisual consult and upload a picture of the rash. The urgency depends on the severity of your symptoms. ...Read more

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Small bumps spreading on body? Doctor says its heat rash or allergies? It's been 6 days. Very itchy. Wrong diagnosis?

Small bumps spreading on body? Doctor says its heat rash or allergies? It's been 6 days. Very itchy.  

Wrong diagnosis?

Allergies or hives: You need re-evaluation by your doctor or dermatologist. Hives (urticaria) is a form of allergic reaction with welts that come and go (increased on skin folds/creases, or after scratching). Many other causes of itchy rash - such as scabies (intense itching, starts in one place and spreads, small bumps + scratch marks, it spreads to others), drug reaction, food allergy, liver disease,... etc ...Read more

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How do you tell the difference between heat rash and rosacea?

How do you tell the difference between heat rash and rosacea?

Rosacea: "heat rash" generally occurs on the body in warm or flushed skin. Rosacea occurs on the face and is generally independent of skin temperature, though it may appear more red when warm. A dermatologist can help with diagnosis and proper treatment. ...Read more

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


Heat Rash (Definition)

The medical term is miliaria. A heat rash is a skin irritation that typically occurs during hot or humid weather. It results when sweat ducts are blocked, and sweat builds up under the skin. Symptoms of a heat rash include small red bumps and vesicles that ...Read more