A rash is a change in the skin’s color or texture. Proper diagnosis is the most important in order choose the best therapy. Simple rashes are called dermatitis, which means the skin is inflamed or swollen. Other common rashes include eczema, psoriasis, impetigo, shingles, chicken pox, measles, insect bites and those caused by medical conditions such as lupus or rheumatoid arthritis. Dr Nicolaides may prescribe an over-the-counter topical product, a prescription topical or oral medication to treat the various rashes.