3wks sore spot 4in long on back of head. Feels like bruise but not. Now in the middle of it iuarter size lump with fluid. Dizzy. Sometimes itchy/throbs.?

SORE SPOT ON SCALP. This sounds as if it could be shingles. See a dermatologist or your family doctor as quickly as possible. It also be an infected cyst. In any case see a doctor!