Stevens-Johnson syndrome: a diagnostic challenge in the absence of skin lesions.

We report a 14-year-old boy with Stevens-Johnson syndrome who presented with mucous membrane lesions but without skin lesions and discuss the differential diagnosis of oral mucous membrane lesions in childhood. Stevens-Johnson syndrome in children is most frequently caused by a Mycoplasma pneumoniae infection. The full clinical picture of Stevens-Johnson syndrome can be present before seroconversion of Mycoplasma antibodies is observed.