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You don't seem to have got my last post. Your rash and itching seem suggestive of either a viral exanthem or post-viral urticaria or a combination of the two.

A viral exanthem is a self-limiting viral infection of the skin (think of it as 'flu of the skin'). This often comes on along with or soon after a systemic viral infection (the cough and cold that you had). Urticaria is a systemic hypersensitivity reaction manifesting as generalized itching with or without transient raised bumps and often has swelling of the lips as well. The good news is that neither of these two conditions are serious and both subside spontaneously in a few weeks.

A regular viral exanthem resolves in 7-21 days. No particular treatment is required if the rash is asymptomatic but since yours is itchy I would recommend applying 1% Cortizone cream twice a day on the rash and taking Tab Claritin 10 mg once or twice (whichever keep the itching and lip swelling under control). The Claritin will also control the urticaria.

Hope this information is useful, please feel free to ask if you have any queries.