Historically, dermatologic surgeons have been the pioneers and leaders in the field of cosmetic and medically necessary skin surgery. In fact, the science of many of the cosmetic surgery procedures and skin cancer treatments performed today were either originated or enhanced by dermatologic surgeons. For example, these skin surgery experts invented laser surgery for birthmarks, liposuction using local anesthesia, hair transplantation, the use of many filler substances, most chemical peeling treatments, botulinum toxin type A therapy, laser hair removal, laser resurfacing for wrinkles, many leg vein treatments, microdermabrasion and more.