Erythroderma. 2 main causes are "acquired erythroderma" (= "acquired ichthyosis") and "erythrodermic psoriasis". Both can be induce by a drug (including antiviral treatment) but; in practice there is one importand difference: unlike "acquired erythroderma"; "erythrodermic psoriasis" will relapse often during all life, even if you stop the drug which induced the problem. See "30-erythroderma"

This patient has also abnormal dark skin. See "Black syndrome"