Linear eczema induced by oral isotretinoin.

Eczema can manifest in a linear arrangement, as can other inflammatory conditions. We report a case of a teenager who, during treatment with oral isotretinoin for acne, developed a generalized eczematous dermatitis together with a superimposed linear eczema on her posterior lower limb. We hypothesize that a postzygotic mutation caused an increased sensitivity to the impact of oral isotretinoin on the epidermal skin barrier structure and lipid composition within a specific skin segment.