Primary lesions in Dermatology

Primary lesions in Dermatology
1MaculesFlat lesions
Changed color
Blanchable erythema <5 mm diameter
Solid lesions
< 5 mm in diameter
3Plaques Flat, plateau-like surface> 5 mm in diameter
4Nodules Rounded configuration> 5 mm in diameter
5WhealsPapules or plaques
Pale pink color
Classic (nonvasculitic) wheals are transient
Last only 24 h in any defined area
6Vesicles Circumscribed, elevated lesions containing fluid< 5 mm
7Bullae Circumscribed, elevated lesions containing fluid> 5 mm
8Pustules Raised lesions containing purulent exudate varicella or herpes simplex – evolve to pustules
9Nonpalpable purpura Flat lesion due to bleeding into the skin
10Nonpalpable purpura -PetechiaePurpuric lesions <3 mm in diameter
11Nonpalpable purpura -EcchymosesPurpuric lesions >3 mm in diameter
12Palpable purpura Raised lesion , vasculitis with subsequent hemorrhage
13Ulcer Defect in the skin extending at least into the upper layer of the dermis
14Eschar Necrotic lesion covered with a black crust
15Tumor Similar to a nodule> 10 mm in diameter
16Bulla bulla is a large blister> 5 mm in diameter
17Cystepithelial-lined cavity
18PseudocystSimilar to a cystCollection of cells without a distinct membrane – epithelial or endothelial cells
19Welts occur as a result of blunt force being applied to the body Elongated objects without sharp edges
20Telangiectasia represents Enlargement of superficial blood vessels to the point of being visible
Primary lesions in Dermatology

The measurements of lesions like macule, papule and patch – where it is taken as 5 mm at some referenced given as 10 mm. so both may be considered as correct.

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