Flesh grains under the armpits are usually caused by filiform warts, molluscum contagiosum and other diseases. 1. Filiform warts: a benign proliferative disease caused by the HPV virus entering the epithelial cells through breaks in the skin and mucous membranes to replicate and proliferate. The skin lesion is a single thin and soft filiform protuberance, which can be skin color or gray-brown, and is located in the eyelids, neck, armpits, scalp and other parts of the body, usually no self-conscious symptoms, but when pulling, there will be a painful sensation. 2. Soft fibroma: the etiology is not clear. The lesions are generally filiform, bulbous or pocket-like protrusions, and soft and inelastic, occurring in the anterior neck, armpits, eyelids and other parts of the body, and the patients have no self-conscious symptoms. In addition, armpit granules may also be caused by other factors, it is recommended to consult a doctor in time to find out the cause of the disease.