Hello
Thanks for writing to H.C.M. for your query.
I have gone through your query regarding an small round cut behind left ear, it does not hert and last year you had peel it out than at that time it was bleeding.
Your history of illness suggest that it may be POST AURICULAR
SINUS. This is a congenital defect, and if it gets infected and pops out pus than surgery is only treatment.
Regards.