Small granules around the nose and chin are considered to be the most likely cause of acne, which is related to excessive sebum secretion, abnormal keratinization of follicular sebaceous gland openings, and infection by Acinetobacter propionicus. 1. Excessive sebum secretion: Especially in hot summer, sebaceous glands secrete a lot of sebum, which tends to block the pores, leading to the growth of small particles around the nose and chin. 2. Abnormal keratinization of follicular sebaceous gland openings: When the openings of follicular sebaceous glands are abnormally keratinized, the overproduced sebaceous glands may gather locally, forming acne and manifesting in the form of long small granules. 3. Infection by Acinetobacter propionicus: While the sebaceous glands secrete too much, the composition of the sebum they secrete changes, making it easier for microorganisms such as Acinetobacter propionicus to multiply, which causes an inflammatory reaction and the appearance of long small particles on the chin. In addition, there are more causes of small granules around the nose and chin, and it may also be cornu rashes, the cause of which is unknown, and is considered to be related to heredity and other factors. It is recommended that patients with small particles on the nose and chin go to a regular hospital in a timely manner, after a clear diagnosis under the guidance of the doctor standardized treatment.