My roommate has a weird rash?

Doctor to evaluate: Rashes and spots are difficult to describe in words. Generalized spots may be part of an allergic reaction or an infection. "Generalized" means the rash is all over the body. Bluish or purplish spot are blood spots and would need blood testing right away. Sometimes, spots have unknown causes. A primary care doctor or dermatologist can examine both the rash and the patient, to find a diagnosis.