Tincture of hydrochloric acid is used on the scalp to relieve itching, sterilize the scalp, and dissolve keratin. Chlorine tincture, also known as tincture of chlorosis, is a compound preparation, the main ingredients of which are chloramphenicol, salicylic acid and alcohol. Chloramphenicol is a broad-spectrum antibiotic that is primarily anti-inflammatory; alcohol is a topical disinfectant that is antiseptic; and salicylic acid is a keratolytic chemical that also has an anti-itching effect. When used on the scalp, tincture of hydrochloric acid can be used to treat seborrheic dermatitis and scalp folliculitis. However, local burning, stinging, peeling and other adverse reactions may occur, and when the symptoms are serious, the drug needs to be stopped and symptomatic treatment. Allergic to the components of the drug should be prohibited. In order to ensure the safety and effectiveness of the drug, it must be used under the guidance of a specialist to avoid adverse consequences.