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Doctor insights on: How To Tell The Difference Between Heat Rash And Allergic Reaction In A Child

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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
2,615 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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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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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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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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I have something on my chest that's bumpy and itchy and it's been spreading. I thought it was a heat rash but it could be an allergic reaction.?

I have something on my chest that's bumpy and itchy and it's been spreading. I thought it was a heat rash but it could be an allergic reaction.?

Hard to say: Symptoms can be concerning for hives, contact allergy, fungal infection or heat rash. Hard to say with out looking at the rash and getting more history. Follow up with a physician if it doesn't resolve. ...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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Please tell me the difference between baby eczema and baby heat rash?

Please tell me the difference between baby eczema and baby heat rash?

ECZEMA /HEAT RASH: Eczema is a chronic skin condition and often needs moisturisering the skin and may need some mild steroid cream locally. Presents with dry scaly patches and rash and can be mild and in some cases severe heat rash is a mild self limiting skin rash which clears up by itself and does not require any treatment except avoiding excessive heat to reduce sweating. In very severe cases you may use steroid. ...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

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What is the difference between baby heat rash and baby eczema?

What is the difference between baby heat rash and baby eczema?

Time and cause: Heat rash is caused by sweating and occurs frequently on the neck and back. Eczema is due to sensitive and sometimes allergic skin conditions and is a chronic condition. See your doctor for proper diagnosis and treatment. ...Read more

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What is the difference between heat rash, heat stroke and sun poisoning?

What is the difference between heat rash, heat stroke and sun poisoning?

All quite different.: Heat rash (or prickly heat, or miliaria) is the rash produced when heat causes your sweat glands to plug up. Heat stroke is the overheating of your entire body when you spend too much time in a hot environment, become dehydrated, and can't produce enough sweat to cool your body. Sun poisoning is just another name for a bad sunburn. ...Read more

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What is the difference between heat rash and sun poisoning rash?

What is the difference between heat rash and sun poisoning rash?

Heat rash: Heat rash occurs in the folds of the skin such as waist, underarms, etc. Sun poisoning or sensitivity is just that, more related to direct contact with sunshine. ...Read more

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What is the difference between heat rash and poison ivy?

What is the difference between heat rash and poison ivy?

Vast: Ivy dermatitis is an allergic reaction present only on areas exposed to the sap of the plant. Itching is intense and blisters are common. Ivy dermatitis shows lines and patterns. Heat rash is diffuse and symmetrical. It is much less itchy. Blisters are not usually present. ...Read more

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How to tell difference in heat rash and yeast infection?

Smell and pattern: Yeast infections are usually bright red with little red dots at the outside border. Heat rashes are much more diffuse. ...Read more

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Heat rash or shingles on face. Not painful like shingles but used to have it many of times as a child. Want to make sure it's not shingles

Heat rash or shingles on face. Not painful like shingles but used to have it many of times as a child. Want to make sure it's not shingles

Specific location: Shingles are going to be localized to the distribution of a specific nerve root & only on one side of the face. (never crosses the midline) It is often most painful before the spots emerge & rarely happens more than once. I've seen it as early as 15 months but it is unusual before late adulthood. If this happens repeatedly it is likely something else. An exam can confirm or exclude shingles. ...Read more

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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


Dr. John Chiu
1,037 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