<unk>  is a genetic disorder discovered by French dermatologist Ferdinand-Jean<unk> .<unk>  is known because of dark crusty patches on the skin, sometimes containing pus.  The crusty patches are also known as keratotic papules and also called keratosis follicularis.
Darier's disease
Jeune's disease
Dent's disease
Bowen's disease
Lev's disease
Grover's disease
Kienbock's disease
Bowen’s disease