Two cases of perianal streptococcal dermatitis (PSD) occurred in a brother and sister, aged 4 and 6 years, respectively. The diagnosis was confirmed by the detection of group A β-hemolytic streptococci in the perineal area and pharynx of both patients. We emphasize the importance of a quick and accurate diagnosis of the infection because PSD is frequently confused with other perianal diseases of infancy.
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