Soft fibroma - 软性纤维瘤 https://en.wikipedia.org/wiki/Skin_tag
软性纤维瘤 (Soft fibroma) 是一种软性结节,常见于颈部、腋窝或腹股沟。

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References A soft fibroma of the nipple - Case reports 36276909 
NIH
虽然 soft fibroma(软纤维瘤) 通常出现在颈部、腋窝和生殖器区域等皮肤皱褶处,但它们也可能出现在乳头上,尽管这种情况很少见。医生在评估乳头异常时应牢记 soft fibroma(软纤维瘤)。
Although soft fibromas occur in the intertriginous area, including on the neck, axillae, and vulvovaginal locations, in rare cases, they can develop in the nipple. Doctors should consider soft fibroma as one of the differential diagnoses for nipple lesions.