Hi. Thanks for your query. Noted the history of a felling of sitting on a gold ball on sitting down and a pin hole in the butt crack with a hair. This is classical finding of a pilonidal sinus. The definite treatment is possible by excision of the total sinus tract and allow it healing first intention. There are chances of recurrence as you may be hairy and the cut hair from the buttock and back and head get entrapped again, causing the sinuses. Consult a General Surgeon for clinical evaluation and proper surgery asap.