During my teen years I struggled with back acne, and my sister even more so. It wasn't until a few years ago that I realized my conditioner may be the culprit. I believe that conditioners containing an ingredient called panthenol often cause cause acne and blemishes along the hairline and the back area where conditioner residue resides. Panthenol is commonly found in conditioner to provide strength to the hair, but in order for it to attach to the hair follicle and smooth the