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Module title = Tutorial: Derm Morphology
Lesson title = Patch
This is lesson 4 of 18 in this module
Patch
A primary morphology
Definition:
flat: if you palpate a patch, you will not feel it at all
size: greater than 1 cm diameter (larger than a macule)
color: any color
General Explanation for a Patch:
There is a change in colour of the affected area that does not result in thickening or thinning of either the epidermis or dermis and therefore the colour change does not correspond with the lesion being palpable. The colour change can be due to things like blood or melanin (the substance that gives our skin pigment). The only thing differentiating a patch from a macule is the size of the colour change. Patch >1cm.
Examples:
Vitiligo: loss of all pigment within the skin
Cafe-au-lait macule: although called "macule" this is a misnomer. Generally a cafe-au-lait macule is greater than 1cm and non-palpable so would be classified as a patch; it is typically a brown patch anywhere on the body
Images:
(this example is hypo-pigmented = lighter)
Lesson 4 of 18
That was the last lesson!
