Less obvious causes include chronic bacterial and fungal infections, various peripheral vascular diseases and neuropathies, systemic scleroderma, and tumors. Excoriation is a linear or hollowed-out crusted area caused by scratching, rubbing, or picking. Lichenification is a thickened skin area with accentuated skin markings. Atrophy manifests as paper-thin, wrinkled skin. It occurs in the aged, in discoid LE, after long-term use of topical potent corticosteroids, and sometimes after burns.
Scars are areas of fibrous tissue that replace normal skin after destruction of some of the dermis.
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