Mine is purple, I have extreme pain, and it's oozy... and I want to conatact a doctor but my grandma won't let me because she works at the hospital and all of the doctors know me and so she dosen't want to doctors to know that her granddaughter did something stupied like that. What should I do

You need to go anyway. Your grandma is extremely selfish. Kids do dumb things that's just part of growing up. Get that thing looked at seriously. Besides, doctors must keep their doctor/patient confidentiality even from family if you don't want them to know.