Sticky armpits may be caused by hyperhidrosis and seborrheic dermatitis. 1. Hyperhidrosis: Hyperhidrosis is mainly caused by excessive sweating of the skin, which may also be caused by autoimmune diseases. And the high weather temperature may also induce excessive sweating, resulting in odor and excessive sweating of the skin after the disease. If left untreated, it can cause the armpits to become sticky. 2. Seborrheic dermatitis: Seborrheic dermatitis is a chronic inflammatory skin disease that occurs in the seborrheic area. The cause of the disease is not completely clear, and is related to genetic factors and microbial factors. After the disease will lead to local skin itching, scaling greasy and so on, at the same time it will lead to a sticky feeling in the armpit. Usually pay attention to local hygiene, timely cleaning, armpit sticky obvious or discomfort should go to the hospital in time for examination and treatment under the guidance of the doctor.