I have been aware of a small round lump near my anus?

for about 3 months now i have been aware of a small round lump near my anus. sometines there is mild pain and discomfort. now and again i experience what i believe is puss coming from the site but i cant say entirely. im looking for advice as to what it may be so i can stop worrying

Age: 28
Male
Medications: none

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