it depends on the degree of damage to the scalp. if you had a severe chemical burn there is a chance that it may not grow back. however if the bald spot resulted from traumatic pulling or friction -- such as from a hairpiece or a hair clip -- the hair may grow back just fine. see your dermatologist for intralesional injections of triamcinolone to help it regrow sooner. topical minoxidil may also help it regrow.
is it true that once you develop a bald spot due to some kind of damage the hair can never grow back on its own?