Perianal dermatitis of the new-born is considered an irritant response to faecal constituents. Erythema of the perianal skin makes its initial appearance during the first 8 days of life. In childhood, inflammation of the perianal skin and mucosae may occur due to bacterial infection (beta-hemolytic streptococci. Differential diagnoses include psoriasis, candidiasis, sexual abuse and inflammatory bowel disease.
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