For 6 months I've acne-like condition on the back of my head. Tender spots, tiny scabs if I scratch them too much. Capasal shampoo helps a bit. Ideas?

Office visit. This may be anything from a psoriasis variant to a folliculitis. This sort of thing is best handled in a family physician or dermatologist's office -- if my online experiences have taught me anything, it's not to try to second-guess a rash that i can't see in person. Good luck.