I have a cystic pimple on my cheek. Tried popping it and failed. Now it's bigger, purple/black in colour and very sore. What do I do?

See a dermatologist. The acne cyst can be injected with kenalog (triamcinolone) which should help shrink it. Usually trying to pop a pimple creates more inflammation and pain. Your dermatologist may also want to determine if there is any infection there.