Ichthyosis, from Ancient Greek for “fish”, is a heterogeneous (unrelated parts) family of about 28 known skin disorders (Wikipedia) that all resemble fish scales due to inflicting the sufferer with extremely cracked, dry skin. There are various levels of severity, from the mild ichthyosis vulgaris which is basically chronic, flaking skin, to the life-threatening harlequin ichthyhosis, which causes keratin thickening in fetal skin (above right) so badly that the skin can’t shed fast enough. People born with harlequin ichthyosis are born with such thick skin, it’s almost like an armor. Eventually the skin falls off as the baby grows, but they are prone to deadly bacterial infections if their skin cracks. Most don’t make it past infancy.
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