Hi there, Thanks for your queries. The common causes of facial rash are Allergy : to facial lotions, creams, moisturizers, cosmetics or medicated creams etc.. Acne Rosacea Heat rash (prickly heat) is due to humid climate, or exposure to sun. Precautions that you can take:- - Stop use of new facial cosmetic, if any. - Wash your face with mild soap and water frequently - Avoid exposure to direct sunlight - Avoid use of any facial cream/lotion or other cosmetics if living in a humid climatic area. Since the details given by you are inadequate, you may consult your Dermatologist who will examine you to determine the cause of rash, and prescribe appropriate treatment. Hope I have answered your query. Dr. Rakesh Karanwal