[Spiny hyperkeratosis of the palms and soles]

Spiny hyperkeratosis of the palms and soles is a rare dermatosis presenting as multiple tiny keratotic plugs on the palms and soles. There are two different forms of spiny keratoderma of the palms and soles - the hereditary form and the acquired form. The latter is usually associated with internal malignancies or systemic disease. Since spiny hyperkeratosis of the palms and soles has been under-reported and under-diagnosed, it is important for dermatologists not to forget this disease in daily practice. We report this rare disease for the first time in the German literature.