When the skin is injured, the internal anal sphincter muscle may go into spasm, which reduces blood flow to the area and prevents the crack from healing, often creating a painful cycle. Common Symptoms Anal fissure - Symptoms and causes - Mayo Clinic
Cracked and raw skin around the anus is often caused by , which are small tears in the lining of the anal canal. These tears frequently result from trauma, such as passing hard stools due to constipation, or from irritation caused by chronic diarrhea. Cracked Raw Skin Around Anus
