Castor oil may help tighten sagging skin under the chin or near the neck, though no studies thus far have conclusively shown this. But does it live up to the hype? Let's dive in. Tighten Under Chin, Face Firming Skin Tightening, Tighten Skin On Face, Oil For Skin, Castor Oil For Wrinkles, Neck Skin Tightening, Castor Oil Skin, How To Tighten Skin, What Does Castor Oil Do For Skin