The ‘Iris lesions ’ are pathognomonic of

Erythema Multiforme The classic skin lesion consists of a central blister or necrosis with concentric rings of variable color around it called typical “target” or “iris” lesion that is pathognomonic of EM; variants are called “atypical target” lesions (Figure 4-16). The skin may feel itchy and burnt. Postinflammatory hyperpig - mentation is common in dark-skinned individuals and may be worsened by sun exposure.