An<unk>  is a break or tear in the skin of the anal canal.<unk> s may be noticed by bright red anal bleeding on toilet paper and undergarments, or sometimes in the toilet. If acute they are painful after defecation, but with chronic<unk> s, pain intensity often reduces.<unk> s usually extend from the anal opening and are usually located posteriorly in the midline, probably because of the relatively unsupported nature and poor perfusion of the anal wall in that location.<unk>  depth may be superficial or sometimes down to the underlying sphincter muscle. Untreated<unk> s develop a hood-like skin tag (sentinel piles) which cover the<unk>  and cause discomfort and pain.
Anal fissure
Anal cancer
Anal fistula
Necrotizing enterocolitis
Perianal hematoma
Anal wink
Anal plug
Genital ulcer