Hyperkeratosis Lenticularis Perstans

A rare skin disease characterized by usually asymptomatic, hyperkeratotic, reddish-brown papules primarily located on the lower extremities. Histological examination shows lamellar hyperkeratosis with abrupt peripheral basket-weave orthokeratosis, irregular acanthosis, and underlying lichenoid lymphocytic infiltrate. The condition may be sporadic or familial.