Onychodystrophy due to porokeratosis of Mibelli: a rare association.

Porokeratosis is a specific keratinization disorder that manifests clinically as well-demarcated annular or linear keratotic plaques of various sizes and forms and with distinguished histology showing cornoid lamella, which is a column of closely packed parakeratotic cells extending through the stratum corneum. Nail changes secondary to porokeratotic lesions involving digits are quite uncommon and rarely reported in the porokeratosis of Mibelli (PM) subtype. Here we report the case of a young girl with a PM lesion over the hand along with nail dystrophy of the involved digit.