Small granules under the corners of the eyes are usually caused by contact dermatitis, milia, and hidradenitis suppurativa. 1. Contact dermatitis: it is usually caused by the allergic reaction of eyelid skin to certain allergens. Under the stimulating effect of inflammation, it can lead to the appearance of small granules under the eyes, and can also be accompanied by obvious itching, burning, reddening of the skin and other symptoms. 2. Corns: a kind of benign cysts on the skin, usually seen in young and middle-aged women, skin damage occurs in the eyelids, forehead and cheeks, mainly manifested as white or yellowish pimples, the size of a grain of rice, with a smooth surface, no other symptoms, no pain, no itching. 3. Sweat duct tumor: Sweat duct tumor is a kind of benign tumor involving sweat gland ducts, mostly occurring in young women, manifested as a single or multiple small pimples, normal skin color, yellowish, or brown, often without self-conscious symptoms. If the small particles appearing under the corner of the eye, after observing for a period of time can not subside by themselves or accompanied by other discomforts, you should go to the hospital in time for examination, after clarifying the specific causes, and then treated under the guidance of the doctor.