Marasmus is total caloric malnutrition with resultant catabolism and utilization of muscle and fat. It presents with a classic monkey facies.
Kwashiorkor is protein malnutrition with normal to excessive carbohydrate intake. Classic skin findings include mosaic skin which is dry, fine areas of desquamation with cracking along skin lines, and "enamel paint" dermatoses which evolves into large areas of erosion and desquamation. Hair in affected patients is sparse, thin, fragile and depigmented.
Acrodermatitis enteropathica can occur due to acquired zinc deficiency or can be due to an autosomal recessive disorder of zinc transport.