Scar is another secondary descriptive term used to describe the healing of the epidermis and dermis, usually in a linear or a geographic pattern, caused by some form of trauma or end-stage inflammatory process. Fresh scars are typically pink to red; over time, they mature, becoming flattened and more pale.
Lichenification is seen as an end process in chronically rubbed skin. The skin lines become accentuated and thickened from the chronic rubbing. A classic example of lichenification is lichen simplex complex.
The last of the secondary descriptive lesions discussed here are burrows. Burrows are seen as tiny, irregularly shaped, serpiginous or linear scale, often with a tiny black dot at one end. They are pathognomonic for the diagnosis of scabies, and the tiny black dot represents the scabies mite.
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