There is a hard and painful nodule on the left side of the anus, which is considered to be folliculitis, perianal abscess or anal fistula.
1. Folliculitis: related to personal skin uncleanliness. When the skin follicles on the left side of the anus are damaged, bacteria invade the hair follicle tissue can cause folliculitis. The performance of the left side of the anus appear hard nodules and pressure pain, with the gradual development of the condition, the surface of the hard nodules appear white head and pus breakthrough outflow.
2. Perianal abscess: when the left paranal tissue is attacked by bacteria, perianal abscess will be formed and painful to press, which can be diagnosed by ultrasound, CT and other auxiliary examinations.
3. anal fistula: anal fistula is mostly secondary to perianal abscess lesions, that is, perianal abscess rupture after the formation of anal fistula. The fistula will form a hard knot and painful when pressed.
In short, the discovery of the left side of the anus with hard knots and pain should be timely consultation, examination and treatment under the guidance of the doctor, so as not to delay the condition.