Cystic acne occurs very deep under the skin's surface ... and you’ll be left with a bloody spot,” says Joel Schlessinger, MD, a board-certified dermatologist. Causes of cystic acne ...

It will probably come as no surprise that acne ... a cyst bursts, it creates what is called a sinus tract— “a little hole in the skin where you'll see drainage of pus or potentially blood ...

It’s caused by an uptick in oil production, which manifests as cystic ... spike in blood sugar can initiate a hormonal ...