Hi. I am 21 years old & I have had a lump right under my tailbone on the right so for as long as I can remember. I went to my family dr & they said it was a pilonidal cyst but when I went to get it removed the surgeon said it was not a pilonidal cyst so I had to go for a ultrasound. Its a lump that's kinda hard but moveable and probably just about the size of a golf ball maybe smaller. It gets soar after sitting for long periods and just lastnight my lower back was swollen and tender. I don't know if I should go to the hospital or wait 2 days to see my doctor? Can anybody help me?!