I'm not positive, but from the photo it looks like a cyst to me? Cystic acne perhaps? How long has it been there and does it have any kind of head forming? You can ice it for a few minutes on and off for about 30 minutes twice a day to help decrease inflammation as well as taking a couple Ibuprofen which should help with any discomfort If you're desperate dermatologists can inject the spot with a cortisone injection that will make it disappear within 24-48 hours.