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Dr. Chip
Dr. Chip, General pratice
Category: Dermatology
Satisfied Customers: 31658
Experience:  Years of outpatient experience treating dermatological problems
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Yesterday part of my upper arms became a blotchy red colour

Customer Question

Yesterday part of my upper arms became a blotchy red colour and felt extremely hot. What could this be? I feel fine otherwise. I have attached a photo.
Submitted: 9 months ago.
Category: Dermatology
Expert:  Dr. Chip replied 9 months ago.

Hello and welcome. I'm Dr. Chip

I looked at your photos, and this is an allergic dermatitis. It can be caused by contact with an allergen as with new soaps, new detergents, etc., but quite often we never figure out what triggered it.

Nothing too serious and you can take Benedryl or Claritin orally and apply Calendula or Caladryl over the counter creams for a couple of days, at which time it should resolve.

Please let me know if you need any more information.

Customer: replied 9 months ago.
This has been happening on and off for the last four weeks since I went back to college and changed accommodation. When I exercise and sweat i get what looks like bites from something and my whole body turns red which fades again when I cool down. Heat always makes it worse. Is this also from allergic dermatitis?
Expert:  Dr. Chip replied 9 months ago.

Hi again--then it's a similar condition but that's called temperature urticaria. It's treated with oral Claritin or Zyrtec daily. Usually it stops happening within a few months

Customer: replied 9 months ago.
Could it be livedo reticularis?
Expert:  Dr. Chip replied 9 months ago.

Sorry for the delay.

That's a possibility but usually it's cold that causes it, not heat.

If it were, there's no real treatment for it.