Acquired crateriform hyperkeratotic papules of the feet: an unusual variant of focal acral hyperkeratosis.

Clinically, clear cell hidradenoma presents as a slow growing, solitary, freely mobile and firm nodule. Occasionally, there may be a cystic appearance. The lesions may be skin-colored, red, blue or brown; multiple lesions are rare. There is a predilection for occurrence over the scalp, face, thorax and abdomen; however, the tumor may be located anywhere on the body.[3] Rarely, malignant transformation of clear cell hidradenomas with metastasis has been reported.[2] The presentation of our patient is considered to be unusual because of the early age of onset and clinical picture.