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Red rash on area without clothing everytime after swimming, mildly itchy, disappears within a hour, uses sunscreen, taking Coumidin, metropolol. Cause?

I break out in a bright red rash every time I swim at a local outdoor pool. Never happened before this summer, but has now happened three successive times. Mildly itchy, does not appear where clothing is worn (like under bathing suit, or when trunk covered by shirt). Does appear on front and back of legs, feet , front and back of arms, and scattered across front and back of trunk if no shirt worn. Onset is about 15 minutes after I enter pool. Disappears about 30-45 minutes after I leave pool. I m generally in the pool 45 minutes doing a workout. Seems to be independent of whether I have applied sunscreen or not. Was swimming inside until about 3 weeks ago, without rash (different pool). Only new medicines I m on that I did not take last summer when I swam at same outdoor pool are Coumidin and metropolol. No new foods, detergents, clothing, bathing suits, sunscreen products. Any ideas?
Asked On : Sun, 3 Jun 2012
Answers:  2 Views:  148
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Dermatologist 's  Response
Hi...dear tshope..,
Thanks for choosing HCM..,
Bright red rash on exposed parts during swimming..,
Usually due to conact of cold water or using chemicals in the water..,
this is called cold (Pressure) or chemical (Irritant) urticaria..,
So consut dermatologist and do suitable investigations..,
Answered: Sun, 3 Jun 2012
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Pediatrician Dr. Rajiv K Khandelwal's  Response

Thanks for your query and a detailed description. It appears that some chemical during the treatment of the water is causing this problem. It is very difficult to pin-point but it will be a good idea to discuss with the management of the pool. It shall be better if you avoind swimming in this pool for a few days and observe the rash.

Wishing you all the best.
Answered: Sun, 3 Jun 2012
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