Summary of case history ,The patient is a young non-lactating woman who had a sudden onset of a right breast lump with redness and pain 3weeks ago,ultrasound suggested an inflammatory lesion,and pathology on puncture diagnosed chronic mastitis.,TCM diagnosis ,Acne vulgaris (lumpy stage), with evidence of stagnant heat in the liver meridian,Western medicine diagnosis ,Chronic mastitis,Therapeutic methods ,1. Oral treatment with Chinese herbal medicine: Initial treatment with Wu Wei Disinfectant Drink combined with Gua Pao Burdock Soup with extra reduction; abscess stage and ulcer stage are treated with the experienced formula Paste Milk No. 2 with extra reduction. 2. External treatment: external application of Golden Yellow Ointment and Hibiscus Ointment, fire acupuncture and Chinese medicine to remove the decay and clear the wound.,Clinical outcomes ,The lump disappeared and the ulcer healed after a total of more than 9 months of treatment and was followed up for 1 year without recurrence.