It's hard for me to tell but it could it be psoriasis? Psoriasis - Symptoms and causes Regardless it might be best to contact your internist or dermatologist for a diagnosis and treatment. Good luck and please let us know the outcome.
Maybe hives? Usually hives are raised welts, but this could be different. In any case, it looks like an allergic reaction to me. NOT contagious. Take an antihistamine and see if that clears it up.