Over growth of skin structure at a localised region is
Ref Robbins 8/e p262; 9/e p13 An overgrowth of a skin structure at a localised region is likely to be indigenous as well as benign , this is more likely to be a hamaoma .it is now considered as a neoplasm
Hamaoma
Malignant tumor
Choristoma
Polyp
General anatomy