What Is not true about Erythema multiforme

Erythema multiforme is a hypersensitivity reaction usually triggered by infections, most commonly herpes simplex virus (HSV)Target lesion is the typical lesion of Erythema multiforme.The initial lesions are sharply demarcated, round, red/pink and flat (macules), which become raised (papules) and gradually enlarge to form plaques.The lesions are first seen on the backs of hands or dorsum of the foot and then spread along the limbs towards the trunk. The upper limbs are more commonly affected than the lower.Ref: illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 186