5 Dermatologists on the Worst DIY Beauty Disasters They've Ever Had to Treat

"A new patient sought medical care at my office after self-injecting hyaluronic acid serum into her cheeks at home. She had watched a video on YouTube about how to do this," [Angela Casey, MD] says.

"She caused infection, inflammation, and scarring in her skin. We had to treat her with antibiotics and oral prednisone."