Definition: a rare genodermatosis characterized by hyperpigmented lesions in linear, zebra stripe, and other bizarre configurations following the lines of Blaschko; occasionally accompanied by other developmental anomalies of the eyes, teeth, nails, skeleton, nails, heart. The dermatologic features involve four stages: stage I is characterized by erythema, vesicles, and pustules; stage II by papules, verrucous lesions, and hyperkeratosis; stage III by hyperpigmentation; and stage IV by pallor, atrophy, and scarring. Historically, there were thought to be two forms: the sporadic type of incontinentia pigmenti (IP1), which is now known to be hypomelanosis of Ito and the familial type (IP2), which is X-linked dominant and a genetic lethal in males.
See Also: hypomelanosis of Ito
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