The effect of a hydrogel made by Nigella sativa L. on acne vulgaris: A randomized double‐blind clinical trial

Nigella sativa L. (black seed) is one of the main medicinal plants frequently cited in traditional Persian medicine manuscripts for management of acne vulgaris. The present study was designed to investigate the efficacy of a topical preparation from N. sativa in acne vulgaris. In a randomized double‐blind controlled clinical trial, 60 patients (30 patients in treatment and 30 in placebo group) were randomly received N. sativa hydrogel...