Squeezing out very fine and long white stuff from the corner of the mouth may be a symptom caused by acne, folliculitis, epidermal cysts and other diseases. The patient should go to the hospital in time to find out the cause of the disease. 1. Acne: Acne is a chronic inflammatory disease of the sebaceous glands of the hair follicles, mostly found on the cheeks, jaw and other parts of the body. Patients mainly show symptoms such as pimples and pustules. When white pimples appear, patients can squeeze out yellowish-white tofu scum-like material, sometimes accompanied by a foul odor. 2. Folliculitis: Folliculitis is an inflammatory skin disease mainly involving hair follicles. Patients will appear in the hair follicle as the center of red papules, there will be white pustules at the top, and there is white pus inside the pustules with odor. 3. Epidermoid cyst: Epidermoid cyst is a kind of dermal cyst containing keratin. It occurs in the head, face, trunk and other parts of the body, and the lesions can be manifested as round cysts of different sizes, and white secretion with bad odor will appear when pressing the periphery of the cysts. Patients who squeeze out a very long and thin white stuff from the corners of the mouth should go to the hospital in time, under the guidance of the doctor to carry out standardized treatment.