Hello I share your concern At the outset, I would like further information for better assessment of the condition Since how long it has been there any history of discharge or pain? complete medical history like diabetes or other metabolic disease If possible upload a photograph I would advise you for a battery of tests after physical examination to establish a diagnosis Meanwhile clean it with antiseptic solution and keep it moist. Apply antiseptic ointment if it is a open and discharging Please write back to me with these details so that I will be able to tell you more precisely. Best wishes