My son is 17 years old and was recently diagnosed with a pilonidal sinus. There was/is no pain, but it did bleed a bit, enough to leave some spots in his underwear and get through to his shorts. He was given a round of anibiotics, the hair on his buttocks has been trimmed, he has seen a surgeon who has decided that the treatment should be conservative for now; there is a bit of discharge from the sinus at times, but very little. Is there anything else we can do? I saw that long term pilonidal sinus' can lead to cancer - shgould I be worried?