1% Coal Tar mainly refers to coal tar lotion, which can be used to treat severe seborrheic dermatitis of the scalp. The main ingredient of 1% coal tar lotion is pure coal tar, which has a good bactericidal effect, and at the same time can improve hair quality and moisturize the scalp. It is commonly used in the treatment of seborrheic dermatitis of the scalp and scalp psoriasis. Coal tar lotion also has a certain dyeing effect, which can make gray hair change color in a short period of time, and at the same time, it can also moisturize the hair and make it smooth and shiny. A common side effect of coal tar lotion is to cause redness, flaking and pain on the scalp. Some patients are allergic to coal tar, and may experience red spots, pimples, and intense itching on the scalp, which can be recovered on their own in most cases after discontinuing use. Coal tar lotion should be consulted with a doctor before use, and the drug should be used under the doctor’s guidance. Avoid sticking to clothes when using to avoid staining them.