A lot of small particles under the eyes, consider the fat grain, chestnut papules, sweat pipe tumor and so on. 1. Fat grains: are small white particles about the size of a pinhead that appear on human skin, most commonly found around the eyes of women, mainly secondary to certain diseases, such as hidradenitis suppurativa, hidradenitis suppurativa, and acne. 2. Cheilitis: a retention cyst originating from the epidermis or epithelium of the appendages, it occurs on the face, especially around the eyelids, the typical lesion is a yellowish-white firm papule with a smooth surface and a rounded tip without fusion, and there is usually no conscious symptom. 3. Sweat duct tumor: it is a kind of adenoma differentiated from the duct at the end of small sweat gland, mostly involving young women, and it can be aggravated during puberty. The reason why some patients appear is mainly due to family genetics. It can be symmetrically distributed around the eyelids, and the lesions are hemispherical or flat papules of skin color or yellowish or brownish color, often with no self-conscious symptoms, and the course of the disease is slow, and seldom subsides on its own. There are other reasons why there are a lot of small particles under the eyes, and it is recommended that patients go to the hospital in a timely manner to improve the examination, and after a clear diagnosis under the guidance of the doctor reasonable treatment.