Wart generally refers to warts, which are benign excrescences caused by human papilloma virus (HPV) infection of the skin mucous membranes, underarm warts are usually common warts or filiform warts and so on. Warts are caused by the infection of human papillomavirus (HPV), whose genotypes may include HPV1, HPV2, HPV4, HPV7 and HPV26-29, and are usually infected through direct contact with the skin. The virus enters the epithelial cells through the skin mucous membrane breaks, leading to their abnormal differentiation and proliferation, thus appearing common warts or filiform warts. After infection with the virus, the initial lesion is a pinhead-sized flat keratinous papule, which gradually grows larger over time to become a rounded elevation, due to the surface of the keratin is generally uneven, the color can be grayish-brown, pale, or leathery, and can be scattered in various parts of the body. The appearance of warts under the armpits, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to choose the appropriate treatment.