I had a small lump around my back side of the head (right portion) since by birth and it was remain as it is but now for last 1 month or it spread a bit and instead of just 1 lump earlier now it is 4/5 lump enhance in same area and there is no hair is growing in this particular area and I got little bit pain occasionally in this area but earlier there was no pain. So, what could the reason behind that? Whether it comes under Dermatology or Neurology and is there any risk for cancer / ulcer due