Hi welcome to the health care magic and thanks for asking your query here Your medical history is strongly suggestive of an perianal cyst which may be a sebaceous cyst, an Epidermoid cysts , Dermoid cysts or Anal duct/gland cysts or it may be a Sacrococcygeal teratomas As you said its very hairly down there so it might be Blocked sebaceous glands most probably Generally no treatment is required but if they become painful then it means they are infected,Then surgical excision by traditional wide excision, minimal excision, and punch biopsy excision may be required. But recurrence is quite common. I suggest you to get the diagnosis confirmed from a dermatologist after examination. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.