A particle growing on the side of the anus may be caused by anal eczema, follicular inflammation, warts and other reasons. 1. Anal eczema: may be due to perianal moisture and lead to a skin allergic reaction, there will be anal parts of the small particle-like papules or papules, there will be itching feeling, scratching may appear local skin ulceration, inflammation and so on. Oral loratadine and other medications can be taken. 2. Hair follicle inflammation: mainly manifested as hair follicles are infected by bacteria and abscesses occur, there will be a slight pain. Erythromycin ointment, fusidic acid and other ointments can be used externally. 3. Condyloma acuminatum: It is a sexually transmitted disease that occurs around the anus, and it is a granular pimple with an uneven surface, or a coronal object, and if it is not treated in time, the area of the warts will gradually increase. It can be removed by laser, microwave treatment and other methods. The particles on the side of the anus, it is recommended to go to the hospital for anal examination, clear cause of the disease according to the doctor’s guidance for standardized treatment.