Abstract
Based on clinical and histological studies in 25 patients, plane warts apparently show a characteristic phenomenon of spontaneous regression totally distinct from that described in common warts. This regression developed during various treatments in 9 cases; in 16 case it occurred spontaneously. In all the patient there was a sudden and systemic onset of inflammation in every flat wart. Within 2-6 wk all the warts completely involuted. Histologically, there were variable degrees of epidermal changes depending on the stage of inflammation. A mononuclear cell infiltration with epidermal invasion was demonstrated in every biopsy specimen. This regressive phenomenon of plane wart is probably mediated by cellular immunity. It represents a natural experimental model of rejection of tumors induced by papovavirus in humans.

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