A 9-year-old boy presented with black scales all over
the body sparing the flexures. There was a history of consanguineous
parentage and prolonged labor. Scaling started from three weeks of age
with exacerbations in the winter and remission in summer. On
examination, there was coarse hyper pigmented scaling over the whole
body (Fig. 1) with sparing of flexures. Right sided
cryptorchidism was present till the age of four years. Ophthalmological
examination, blood counts, chest X-ray and urine examination were
normal. Patient was diagnosed as X-linked ichthyosis based on clinical
features, history of prolonged labor and cryptorchidism. He was
prescribed emollients and 10% urea; he showed improvement in scaling
after four weeks.
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Fig. 1 Generalised dark scaling over trunk with
sparing of flexures.
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X-linked ichthyosis is considered one of the five
main types of ichthyosis. The others being; Ichthyosis vulgaris (no
affection of posterior neck and back of ears, no history of prolonged
labour or cryptorchidism), Lamellar Ichthyosis (scales are larger and
darker in size with affection of the flexural surface), Congenital non-bullous
ichthyosiform erythroderma and Epidermolytic Hyperkeratosis.