The appearance of small meatballs in the armpits is related to local tissue abnormalities, and the causes of the corresponding conditions mainly include cornu rashes, common warts and folliculitis. 1. cornus: and skin follicles secrete too much oil appear clogged, causing local secretion retention is related, usually do not have obvious symptoms. 2. common warts: HPV virus infection after stimulation of local tissue proliferation caused by the general manifestation of filiform or mound-like protrusions, repeated stimulation will appear to increase. 3. Folliculitis: the hair follicles are blocked, resulting in local inflammation, will cause corresponding conditions, most of them will be accompanied by the surrounding redness, swelling, pain. Found underarm small meatballs, and the number of lesions increased, the need for timely medical observation, through the examination of the diagnosis of the condition, under the guidance of clinicians to standardize the treatment, to avoid delays in the completion of the condition.