My derm told me once about a similar story, a guy rubbing his hair too much in an area and losing hair. But you should be able to regrow that IF the hairloss was due to rubbing. Do not confuse with male pattern baldness.
Hydrocortisone is something you should give a try. Get the weak stuff (1% or less), put a tiny amount on everyday for a month. If nothing happens, stop it.
