According to WebMD, some people use castor seed paste on the skin to treat a variety of skin concerns like abscesses and boils. The American Cancer Society notes that some people claim castor oil has special dissolving properties to help eradicate corns, bunions, warts, cysts, carbuncles and tumors, but states that there is no scientific evidence to support these claims.
According to the American Cancer Society, the use of castor oil dates back as far as the ancient Egyptians. While there is not any scientific proof that castor oil can cure skin ailments, there are some legitimate uses for the substance. WebMD states that castor oil is agreed upon by medical professionals to successfully treat constipation by acting as a laxative. Some people also rely on castor oil to induce pregnant women into labor and help begin the flow of breast milk once the baby is born. The American Cancer Society says that many doctors commonly use castor oil as a carrier agent to transport chemotherapy drugs to malignant tumors.
WebMD warns that castor seeds are extremely unsafe to ingest, as their hulls contain a deadly poison called ricin. As few as one to six ingested seeds can bring about conditions of dehydration, shock, kidney and liver damage, blood cell destruction and death.