ABSTRACT:From their ultrastructural study of incontinenti pigmenti, the authors confirm that in this condition there is no pigmentary anomaly, but that pigmentation is the last step of a still unknown process. At birth those who are affected display an intra‐cellular edema which leads to the formation of a vesicobulla. In all 3 stages, the epidermis shows dyskeratotic cells and a transient pigmentary discharg