Hi, After reading your query it appears that you are suffering form urticaria or allergic rash. Urticaria is a common condition where due to release of histamine from the white blood cells; especially mast cells causes all breaking out with red rashes all over body. It remains transiently for few hours and then disappears its own. You please check out for any recent change in your daily routine where some allergen producing the same is coming in contact. It can be in the food, environmental or some times in your clothes too such as some dyes and fibers. You can take tablet loratadine or levocetrizine or any good antihistamine tablet by mouth for one to two times per day. take care.