Phenotype of patients with linear porokeratosis. (a) Patient 1: Porokeratotic lesions in linear arrangement on the left side of the thorax. (b, c, d) Patient 2: Linear porokeratosis on (b) the left arm, (c) the hand and (d) left side of the back and on the left thigh. (e) Patient 3: Linear porokeratosis on the right arm. (f, g, h) Patient 4: Systematized porokeratotic lesions on the (f) trunk, (g) legs, and (h) feet.