cystic acne?

~❁may flower❁~ • divine creation of love
My boyfriend has cystic acne all over his back, chest, face, and sometimes around his crotch area. He has been to the doctors multiple times and the medicine they prescribe never works. We are trying to heal it in a more holistic way, does anyone have any idea what could possibly help? They're constantly popping and bleeding, he thinks he's gross and disgusting but all I want to do is help him because I love him unconditionally and only want him to love himself.
Have you ever suffered with this kind of acne? If so, how did you treat it? What worked for you?