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An anal fissure is a small tear of your skin just inside the opening of your anus.
They are very common in people of all ages, but are most common in teenagers and young adults.
They can be very painful, especially when opening your bowels (passing faeces: doing a poo). They can be very upsetting but are very rarely serious.
The fissure may bleed a little and stain the toilet paper with bright red blood after opening your bowels.
An anal fissure will usually heal on itsâ€™ own, but this often takes several weeks. The fissure may not heal and may become chronic (persistent). This is because the blood supply may be reduced to the skin of your anus due to the muscles tightening in response to the pain, so preventing healing.