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After hot shower has pinprick size red spots and blotches on belly. Lasted 30min but I took Benadryl (diphenhydramine) after ten min. What would cause this?

2 doctors weighed in
Dr. John Chiu
Internal Medicine - Allergy & Immunology

In brief: Cholinergic urticari

This occurs in some people usually during the cooling period after a rise in body core temperature.
Exercise or stress can do the same. Antihiistamine such as Zyrtec (cetirizine) taken about 1-2 hrs prior to such activities often helps. The problem usually resolves with time .

In brief: Cholinergic urticari

This occurs in some people usually during the cooling period after a rise in body core temperature.
Exercise or stress can do the same. Antihiistamine such as Zyrtec (cetirizine) taken about 1-2 hrs prior to such activities often helps. The problem usually resolves with time .
Dr. John Chiu
Dr. John Chiu
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Dr. Stephen Southard
Internal Medicine

In brief: Cholinergic ...

It is possible that you have a form of cholinergic urticaria.
You should seek the input of your primary care doctor for further testing and treatment. Best of luck.

In brief: Cholinergic ...

It is possible that you have a form of cholinergic urticaria.
You should seek the input of your primary care doctor for further testing and treatment. Best of luck.
Dr. Stephen Southard
Dr. Stephen Southard
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