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• W2268382634 abstract "A 53-year-old female, diagnosed as hypertrophic lichen planus presented to us with white colored patches over her ankles with linear white lines radiating to her legs. She received intralesional injections of triamcinolone acetonide in the skin lesions on multiple occasions in the past for hypertrophic lichen planus. Her general and systemic examinations were normal. Cutaneous examination showed bilaterally symmetrical depigmented patches over both ankles and curvilinear rays of depigmented lines arising from the superior margin of depigmented patch [Figure 1]. The lines extended up to the middle third of both legs [Figure 2]. However, she had no signs suggestive of exogenous Cushing's syndrome. We diagnosed post-intralesional steroid induced depigmentation along the dermal lymphatics and reassured her about the benign nature of the condition and treated her with repigmenting therapy (topical psoralen ultraviolet A therapy and topical calcineurin inhibitor).Figure 1: Linear rays of depigmentation along the path of dermal lymphaticsFigure 2: Depigmented patch on the lateral malleolus with rays of depigmentationCells and tissues of our body are continuously bathed by interstitial fluid that plays an important role in transporting nutrients and oxygen to the cells, and carrying metabolic waste away from the cells. Small ions and micromolecules find their way out through the blood vessel walls while the macromolecules find their way out through the lymphatic channels. Triamcinolone being a lipophilic macromolecule gets extruded via the lymphatics.[1] Corticosteroid molecules are chiefly bounded to two plasma proteins: Albumin and transcortin in the circulation. At low concentrations, corticosteroid exists as bound state with these two proteins. When the concentration of corticosteroids exceeds the threshold of binding capacity, it exists in free unbound form, which is responsible for the therapeutic action of corticosteroid. The etiology of steroid-induced hypopigmentation remains unknown, but it may be related to either the steroid or to one of the supposedly biologically inactive constituents of the vehicle. A review of published reports has shown no reports of depigmentation due to any of these vehicle constituents, so the depigmentation was probably caused by the steroids themselves.[2] Several hypotheses have been advanced to explain the dermatological side effects of steroid therapy, including the mechanical effects of edema,[3] changes in ground substance,[4] a direct cytotoxic effect, and vasoconstriction. It has also been demonstrated that melanocytes are intact in steroid-induced depigmentation, which indicates that steroids may in fact impair the functions of melanocytes.[5] Depigmentation after intralesional steroids can be prevented to some extent by strictly depositing the molecule in the papillary dermis, thereby limiting change in the ground substance." @default.
• W2268382634 created "2016-06-24" @default.
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• W2268382634 date "2015-01-01" @default.
• W2268382634 modified "2023-10-14" @default.
• W2268382634 title "Linear rays of depigmentation along lymphatics after intralesional corticosteroid therapy" @default.
• W2268382634 cites W2019683882 @default.
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• W2268382634 doi "https://doi.org/10.4103/2229-5178.169728" @default.
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