I am having a painless pimple near my butt crack from past 1 month so yesterday I met general surgeon where she just poked the pimple and showed me that it contains blood and pus. Today again I met her so she said that she will treat as a sinus only. But I am not having any openings and actually the pimple is not forming pus also. My question is whether I go for surgery immediately or shall I want to wait till the pimple pains" The pimple is very small and it likes a sponje actually it is difficult to me to identify where the pimple is located really. And my other question is "is this a symptom of sinus" Please doctors write describe whatever you know about sinus and doctors tell me when I actually should meet general surgeon again (means after facing what symptoms). Please doctors help me out and also tell me what are the basic symptoms of sinus.