The nipple next to the growth of a small bump, may be soft fibroid, common warts caused by. 1. Molluscum contagiosum: Molluscum contagiosum is also known as a skin flap, the specific cause of the disease is not yet completely clear, may be related to obesity, diabetes and other factors, easy to occur in the armpits, inguinal, neck, soft and inelastic, often skin color with the skin flap, the patient is generally not any self-conscious symptoms. 2. common warts: the occurrence of common warts and human papillomavirus infection related. The actual warts are usually found on the fingers and the back of the hand, but they can also be found on the back of the chest and the back of the hand due to scratching. The warts are usually grayish-brown or brownish pimples of soybean size or larger, with a rough surface, which can be papillomatous in nature. It is recommended to consult the dermatology department of the hospital for a clear diagnosis. Under the guidance of the doctor to choose the appropriate treatment.