Compound Phellodendron Bark Liquid Coating can be used for the treatment of acne after ulceration. Compound Phellodendron Bark Liquid Coating is composed of Phellodendron Bark, Forsythia, Dandelion, Honeysuckle, Centipede and other medicines, which has the efficacy of subduing swelling and removing rot, clearing away heat and detoxification, and it is mainly used in clinic for the treatment of wound infections and ulcers after ulceration, which belongs to the yang syndrome. Pimples with Yang syndrome are characterized by rapid onset, shallow location, short duration of illness, redness, swelling, heat and pain, restricted root, thick pus after ulceration, etc. This drug is cold and cool in nature. This drug is cold and cool in nature, which can clear heat, dry dampness, detoxify and reduce swelling, and is suitable for the treatment of pimples after ulceration of Yang evidence, and is not recommended to be used for pimples of other evidence types. For other types of acne, it is not recommended to be used. For those who have not yet broken out, it is not recommended to be used at an early stage. It should be noted that this drug can only be used externally. It can be applied externally to the broken abscess or infected wounds by sucking up the drug with gauze. It can also be used to flush the wound regularly. Pregnant women should use this medicine with caution. If the acne is more, or accompanied by other obvious discomfort, should consult a doctor in time to avoid delaying the condition.