Bansai is also known as benzoyl peroxide gel, a drug that does not contain hormones. Its main ingredient is benzoyl peroxide, which is not a hormonal drug. It is an oxidizing agent that, when applied topically to the skin, can slowly release eco-oxygen, which can kill Propionibacterium acnes, and can dry and flake the skin. This drug is mainly used clinically for the topical treatment of acne vulgaris and can provide relief from acne. When using this drug, it should be noted that contact with the eyes, mouth or nasal mucosa should be avoided, and it is contraindicated for pregnant women. In addition, contact with hair or fabrics should be avoided as it may cause discoloration. In conclusion, Bansai (benzoyl peroxide gel) is not a hormonal drug and does not have the side effects of hormonal drugs. It is mainly used to treat acne by other means, through the action of oxidation.