What causes itching on sun exposure?

Hello,

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From your history about the concern, it seems like you have a mild condition of cholinergic urticaria along with photo-sensitivity. Cholinergic urticaria is nothing but developing itching or in some cases itchy bumps when there is a rise in body temperature. I needed you to answer a few more queries for establishing my diagnosis - Onset, at what age did you start experiencing this? Any known allergies? Dust allergies, frequent episodes of cold / running nose? Any family history of allergies? Any medications that you are chronically on? There is no need to panic as this resolves after few - several years on itself. The main thing to do is avoid the triggering factor, like avoiding spicy and hot food, excising in an air conditioned room to a level where your body can tolerate the heat, not over clothing yourself. Also, it would be advised you be on oral anti- histamines meant for itching for sometime, until each episode subsides. And also apply a sunscreen twice in the morning and afternoon, even in winter season as there are ultraviolet rays active even in the cold season. Kindly revert back with the answers to my questions so that I can guide through this and advice a few medical tests to perform.