Linear atrophoderma of Moulin is due to the decreased dermal thickness.

We reported 4 cases of LAM and evaluated the atrophy by high-frequency ultrasound (MD-300S II, MaiDa, China) to further reveal the development of LAM. Linear atrophoderma of Moulin (LAM) is a rare cutaneous disease characterized by the unilateral hyperpigmented atrophoderma following Blaschko's lines without evident inflammation and sclerosis. Histopathologically, LAM was nonspecific and manifested hyperpigmentation in the epidermal basal layer and a mild perivascular lymphocytic infiltration with or without slightly altered collagen fiber.2 The causes of clinical atrophy in LAM were still controversial. [Extracted from the article]