WHAT IS THIS PAINFUL BOIL OR LUMP OR PIMPLE ON MY BUTT!!!!!?

Try taking some warm bathes, No soap. Sit in there as long as tolerated. Try taking a wet wash clothe and put it in a baggie and microwave for a few seconds and put the compress on the pimple. Repeat the process several times. Some boils need to be opened up. If it doesn't go away see your Doctor.