In this procedure, your surgeon will apply the injection directly into your internal sphincter muscle. This year-old man presented with a very painful infection. Prevention of anal fissure You can reduce your risk of developing an anal fissure by preventing constipation. As a result, the muscles around your anus the internal sphincter muscles spasm and tense up. Oxford Medicine Online. To make the diagnosis even more difficult, he had spent some time applying a wide range of OTC creams to the area.
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Read more. Keep the area clean and dry, to prevent infection. An anal fissure is a small tear or ulcer open sore in the skin just inside your anus.