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I saw the pic.
In my opinion, the first possibility is a Fistula in ano.It should have communication into the Anal canal. As it is very close to anal opening, the fistulous tract can be removed easily and completely under Anaesthesia.
Second possibility is a ruptured boil.
As it is present since few months,Fistula in ano should be excluded.
You should consult a General surgeon. Usually, I do a Per rectal examination to identify an Internal opening which communicates from this external opening. If it is not felt,I will pass a thin Probe from the external opening. If it is fistula, then the probe passes smoothly and comes from the internal opening .If Fistula is confirmed, Surgery has to be planned to remove the fistulous tract.The same procedure will be followed by any General surgeon.
There are no medicines for Fistula in ano
Nothing to worry.
It will come down.
Hope I answered your query. If you have any questions, I will clarify further.
Wish you good health.