There are two possibilities that I can think of.First is of folliculitis.Secon
d is of acne keloidalis nucahe. Folliculitis is the inflammation
e or more hair follicles. The con
may occur anywhere on
the skin.Acne keloidalis nuchae occurs when hairs on
and neck grow into the skin, become inflamed, and cause scar tissue.
I would suggest that you get it evaluated from a dermatologist as treatment is different for both.
Hope it helps.