I have what I thought was an infected hair, like a pimple, in the center of the back of my head. painfull when brushing, washing my hair. it was feeling like it was going away, less painfull , about 3 to 4 days later I noticed a scab so I put peroxide on it, it was getting better, I thought until now, it s very painful and a hole like about the size of a tac. I can t bare the pain when I peroxide it now. what else can I do?