Derm Dx: Asymptomatic hyperkeratotic papules

A 51-year-old man with limited mentation is referred for evaluation of 2 papules on his back. The papules are asymptomatic and of uncertain duration. He has been diagnosed with oculocerebrorenal (Lowe) syndrome and has been receiving dialysis for the past 2 years. Medical history is positive for basal cell carcinoma. Examination of the patient's back reveals 2 firm hyperkeratotic papules ...