The diagnosis of<unk>  is clinical. A validated diagnostic criterion is as follows: A patient is diagnosed as having<unk>  if: # On at least one occasion or clinical encounter, he/she exhibits all the positive clinical features, # On all occasions or clinical encounters related to the rash, he/she does not exhibit any of the negative clinical features, # None of the differential diagnoses is considered to be more likely than<unk>  on clinical judgment, and # If lesional biopsy is performed, the histopathological findings are consistent with<unk> . The positive clinical features are: * Monomorphous, flat-topped, pink-brown papules or papulovesicles 1-10mm in diameter. * At least three of the following four sites involved – (1) cheeks, (2) buttocks, (3) extensor surfaces of forearms, and (4) extensor surfaces of legs. * Being symmetrical, and * Lasting for at least ten days. The negative clinical features are: * Extensive truncal lesions, and * Scaly lesions. Differential diagnosis The differential diagnoses are: acrodermatitis enteropathica, erythema infectiosum, erythema multiforme, hand-foot-and-mouth disease, Henoch–Schönlein purpura, Kawasaki disease, lichen planus, papular urticaria, papular purpuric gloves and socks syndrome, and scabies.
Gianotti–Crosti syndrome
Griscelli syndrome type 2
Maroteaux–Lamy syndrome
Griscelli syndrome
Wilson–Mikity syndrome
Toriello–Carey syndrome
Young–Madders syndrome
Wilson's temperature syndrome