Most<unk> s are caused by stretching of the anal mucous membrane beyond its capability. Superficial or shallow<unk> s look much like a paper cut, and may be hard to detect upon visual inspection; they will generally self-heal within a couple of weeks. However, some<unk> s become chronic and deep and will not heal. The most common cause of non-healing is spasming of the internal anal sphincter muscle which results in impaired blood supply to the anal mucosa. The result is a non-healing ulcer, which may become infected by fecal bacteria. In adults,<unk> s may be caused by constipation, the passing of large, hard stools, or by prolonged diarrhea. In older adults,<unk> s may be caused by decreased blood flow to the area. When<unk> s are found laterally, tuberculosis, occult abscesses, leukemic infiltrates, carcinoma, acquired immunodeficiency syndrome (AIDS) or inflammatory bowel disease should be considered as causes. Some sexually transmitted infections can promote the breakdown of tissue resulting in a<unk> . Examples of sexually transmitted infections that may affect the anorectal area are syphilis, herpes, chlamydia and human papilloma virus. Other common causes of<unk> s include: * childbirth trauma in women * anal sex * Crohn's disease * ulcerative colitis * poor toileting in young children.
Anal fissure
Anal cancer
Anal fistula
Necrotizing enterocolitis
Perianal hematoma
Anal wink
Anal plug
Genital ulcer