A lot of small particles on the face may be caused by fat grain, acne and skin allergies. 1. Fatty grains: small bumps about the size of a pinhead appear on human skin, mostly seen around the eyes of women. Fatty grains are benign lesions and generally require no special treatment. 2. Acne: Due to excessive oil secretion from sebaceous glands, which leads to the blockage of hair follicles, small pimples will be formed, manifesting themselves in the form of small particles. 3. Skin allergy: too much ultraviolet light leads to the release of inflammatory mediators from a variety of cells within the skin, causing vasodilatation within the dermis, and the symptom of small granules on the face will occur. You can apply localized saline to alleviate the symptoms. In addition to the above reasons, there are other reasons for the growth of small particles on the face, the symptoms should be timely to the hospital for examination and diagnosis, under the guidance of the doctor, actively cooperate with the doctor’s treatment.