Black seed oil shows potential for preventing or treating several conditions, including rheumatoid arthritis, nasal allergies, diabetes, asthma, and obesity. Topically, people use black seed oil to treat acne, moisturize dry hair and skin, relieve symptoms of psoriasis, and promote hair growth. Apply Black Seed Oil topically to benefit the skin, add the oil to massage oils, shampoos, homemade skincare products, and fragrances. Disclaimer: We sell our oils for external uses only. With topical use, black seed oil can cause a severe allergic rash in some people. Therefore, it is vital to test it on a small patch of skin first to ensure that it does not trigger a reaction. People must also take care to keep the oil away from the eyes, nostrils, and other sensitive body parts.