Castor oil carries ricinoleic acid and omega- 6 essential fatty acids, which accelerate blood circulation to the scalp, hence increasing hair growth, skin. It works on nourishing the scalp and strengthening the roots with the help of essential nutrients. To treat acne with castor oil, you should first wash you face and skin with warm water, which will help you open the facial pores and then either apply the oil topically over your problem areas or massage it into the skin in circular motions