Dermatology - Erosion

Dermatology - Erosion 
An erosion is a superficial skin lesion that affects only the outer layer (epidermis) and does not extend into the deeper layer (dermis).
The erosion is distinctly delineated, crimson in color, and exuding fluid.
The superficial erosions are either subcorneal or extend into the epidermis.
The papillary body has deep erosions at its base. Erosions are not detectable with palpation.
With the exception of physical abrasions, erosions are always caused by the separation of layers within the skin, either within the outermost layer or just below it, resulting in the formation of vesicles or bullae. Erosions consistently undergo complete healing without leaving any visible scar.