Stucco Keratosis Clinical Presentation

Updated: May 17, 2017
  • Author: Katherine H Fiala, MD; Chief Editor: Dirk M Elston, MD  more...
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Presentation

History

Stucco keratosis is a benign lesion that is best regarded as a form of seborrheic keratosis. Stucco keratosis lesions are often seen in elderly men. The stucco keratosis lesions are asymptomatic and usually go unnoticed by both the patient and the clinician.

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Physical Examination

Stucco keratosis lesions appear as keratotic papules or plaques on the lower extremities but are sometimes found on the upper extremities, usually acrally. The lesions are typically less than 1 centimeter in size and are usually white in color.  Note the image below. If the lesion is removed by curetting, a peripheral collarette of scale is sometimes left.

Stucco keratosis in a 70-year-old male veteran. A Stucco keratosis in a 70-year-old male veteran. A few scattered white plaques are on the lower extremity.
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Causes

No known cause of stucco keratosis has been reported. The epidermis is hyperplastic and usually exophytic with no dysplasia. This is similar to what is seen in seborrheic keratosis.  

Various genetic mutations, including PIK3CA and FGFR3 have been reported in common seborrheic keratoses. [4] A 2010 study demonstrated that three of five stucco keratosis samples revealed a PIK3CA mutation, but not the FGFR3 mutation. [5] Further study will likely highlight the genetic background for stucco keratoses.

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