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Dermatology Glossary
Scale (definition)
(skal) (Old English. scealu, Old French. escale, or French. écaille- shell) (Latin. Squama - a scale- or plate-like structure)
A scale is a flat plate or flake of stratum corneum.
Types:
Collarette scale:
Describes the fine, peripherally attached and centrally detached scale at the edge of an inflammatory lesion.
Example: Pityriasis rosea
Describes fine and loose scales.
Example: Tinea versicolor
Describes large, polygonal scales - as in fish scales.
Example: Ichthyosis vulgaris
Describes a silvery, white, parakeratotic, lamellated scale, similar to a scale of psoriasis.
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