Hi for about the last year I have had these red itchy bumps that appear on my upper arms and chest after I take a hot shower or exercise. It doesnt happen if I go swimming or am in any form of cold water. The itching is driving me crazy and I want to know if I can do anything to prevent it.
HiT hank you for asking ChatDoctorI have gone through your query. Your problem is most likely cholinergic urticaria (allergic to heat or after exercise or hot shower). For some people even their own sweat also can be allergic also. We can treat such condition with antihistamines like levocetirizine or HY Chat Doctor.  For some people applying moisturizers will be helpful also. Hope this may help you. Let me know if anything is not clear. Thanks.