Thank you for your medical query at AskTheDoctor.com
I understand your concern.
From your description, these are the following possibilities:
1) perianal abscess
2) post anal dermoid
3) external haemorrhoids
4)fistula in ano
You need to visit a general surgeon as soon as possible to confirm the diagnosis as a fistula or perianal abscess can be extremely painful, and the sooner the treatment initiated, the better. A proctoscopy and per rectal examination is required to confirm the diagnosis.
Hope this was helpful,
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