In 1906 Jadassohn and Lewandowsky described a rare genodermatoses and named it pachyonychia congenita. Pachy means thick. It is a group of genodermatoses involving keratin mutation with thickened nails and variable associated findings. Pachyonychia congenita is a rare disease having four types. However, type 1 and type 2 can be considered common among them. It can often mimic with fungal infection as nail hyperkeratosis can occur in both.
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