Found that both armpits have a bag, should be timely for bilateral axillary color ultrasound examination, by professional doctors after examination, commonly occurs in the armpit of the paratesticular breast, is due to congenital developmental anomalies, developmental deformities caused by. As the breast tissue of embryonic period is not completely degenerated, so the main manifestation is the localized elevated lump, and even some patients will be accompanied by pain, especially the pain has obvious regularity, and aggravated in the pre-menstrual period. Surgery should be chosen if necessary, and depending on the size of the lesion, either local anesthesia or intravenous anesthesia can be chosen to remove the lesion completely to avoid residual, and if necessary, part of the fat tissue in the armpit also needs to be removed. Postoperative pathologic examination is also needed, and attention should be paid to the prevention of infection and other complications, avoiding strenuous activities during the recovery period.