How is hx of SJS lesions?

• Initial skin lesions are erythematous, irregulary shaped, dusky red to purpuric macules (atypical targets), which progressively coalesce • Dark center of atypical target lesions may blister evolving to flaccid blisters • The necrotic epidermis is easily detached at pressure points or by frictional trauma • Patients are classified into 3 groups depending on the BSA: SJS<10% SJS/TEN 10-30% SJS/TEN>30%