Itchy red pustules on scalp after going to hair salon 6 yrs ago.now all over body except face.allergy or follicultis.allergy meds & prednisone no help?

Folliculitis?: If you've been in a hot tub recently, it may be an infection. Otherwise, there is really no way to make a diagnosis over the internet.

Dermatologist: Such a disseminated eruption requires the skill of a good dermatologist for a diagnosis and treatment. Perhaps a biopsy is needed if not already performed.

6 years?: You've really had this for 6 years? Any infection or allergy should have cleared up by now. See a dermatologist and find out what this is! Good luck!

Need to be seen: I recommend seeing a physician soon. The possibilities are many and include everything from atopy to neuroexcoriations to scabies.