Hello, my 9 month old has developed a brownish/red rash on her side temple which has become increasingly worse and has spread over her nose and under her eyes and onto her forehead. It is now on her legs and arms, but nothing on her trunk. She is still eating, drinking and her behaviour has not changed. Her GP wasn't 100% sure what it was but went to her "book" and said heat rash and sensitivity to sun and was told to keep her in a/c. Once it's gone red, it turns yellowish and then brown. It reminds me of a birthmark. It seems to flare up outside and when she cries. Any suggestions?