### Diagnosis Look in a mirror. ### Epidemiologic Risks Puberty. Always a mistake. ### Microbiology A variety of anaerobes. ### Empiric Therapy Try a good squeeze in front of a mirror. Be sure to clean up; everyone hates zit splatter and remember, with every squeeze you are bacteremic. I hope your mitral valve isn't too bad. I would refer you to a good dermatology textbook; this is not a disease that is in my purview, although it was of great interest to my boys when teenagers.