Painful skin rash ears neck face back chest &arms.open wound rash constant draining. itch burns test rule out staph doctors don't know what it is help?

Skin Rash: A skin biopsy, where a physician removes a small sample of skin for testing, is a rapid and convenient office procedure that aids in the diagnosis of a patient's skin condition or lesion. Although usually done by a dermatologist, any physician who is skilled and knowledgeable with the technique and its indications can safely perform a skin biopsy.

Many possibilities: There are many things that could cause a skin rash. Several types of inflammatory conditions of the skin, allergic reactions, sun exposure, insect bites, and sometimes bacterial, viral or fungal infections can cause rashes on the skin. Have it evaluated by a professional and get the appropriate treatment.