I was born with a huge blak birth mark with hair on my back and a few small ones on my legs,hands and under my feet. The one on my back itches I went to a dematologist ,but what ever he gave me for the itch did not work. Occasionally the itching stops and then a few months later it starts back up again. Why does this huge one on my back ihctes but the small one on the rest of my body does not?
