<prompt> What is the most likely diagnosis in a patient with generalized weakness and this finding?Lichen planus pigmentosusSmokers melanosisCushings diseaseDiffuse melanosis cutis  <response>: Answer D. Diffuse melanosis cutisDiffuse melanosis cutis is the correct answer. It is a rare presentation of malignant melanoma with progressive discoloration of the skin. Diffuse melanosis cutis is typically associated with poor prognosis. 