Methylmalonic acidemia (MMA) is an autosomal recessive genetic disorder caused by decreased activity of methylmalonyl-CoA mutase or metabolic disturbance of its coenzyme cobalamin, cutaneous manifestations are rare clinical signs in this disease. Herein, we describe a Chinese boy with MMA fed with a formula lacking branched-chain amino acids presenting with erythroderma and acrodermatitis enteropathica-like rash, a homozygous nonsense mutation c.742C>T (p.
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