Hello

i have a bump on my lower back, on the outer surface of my left butt. it is sort of hard, slightly purple, mostly pink, and doesn't hurt unless i put pressure on it. i have realized that it was there for a while, however this afternoon i took a nap, woke up, and saw that it has literally tripled in size. it is very scary. i have checked online and i do not think it is a hemorrhoid, cyst, abcess, lipoma... it just looks like a hive with a light-purplish center, and it seems under the skin. thank you for help, i am quite afraid...