aPTT prolongation and skin eruption possibly associated with lamotrigine monotherapy in a paediatric patient.

We report the case of a six-year-old female with childhood absence epilepsy who developed combined aPTT prolongation, not corrected by normal plasma, and atypical skin eruption six months after initiating lamotrigine treatment with dose increment. Two weeks after lamotrigine withdrawal, the skin eruption disappeared and aPTT normalised. To our knowledge, this is the first report of aPTT prolongation possibly due to factor inhibitors associated with lamotrigine monotherapy.