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​Differential Diagnosis of Anal Abscess and Fistula 
• Tuberculosis
• Trauma
• Threadworm
• Secondary abscess
• Rectal cancer
• Primary anal gland infection
• Leukopenia
• Inflammatory bowel disease (IBD)
• Infection
• Immunosuppression
• HIV infection
• Drugs
• Diabetes mellitus (DM)
• Crohn’s disease—ulcerative colitis
• Actinomycosis
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