Croton Oil is a natural source of phorbol, phorbol esters and glycerides of saturated fatty acids. Croton seeds are sometimes applied directly to the skin for muscle and joint pain. The main use for croton oil today is as an active ingredient in phenol-based facial peels. Dermatologists, plastic surgeons and other practitioners can vary the amount of croton oil in the peel to customize the treatment for a particular patient or skin area, such as on the neck or around the eyes. In Malaysia, people use croton oil in lamps and in soap.