Primary Lesions of Skin

Macule: Small spot (Less than 5 mm), different in color from surrounding skin, that is neither elevated nor depressed below the skin surface.

Patch: Large spot (>5mm) different in color from surrounding skin.

Papule: Small (less than 5mm diameter) circumscribed solid elevation on the skin.

Plaque: Large (>5mm) superficial flat lesion, often formed by a confluence of papules

Nodule: Large cirumscribed solid skin elevation .

Pustule: Small circumscribed skin elevation containing purulent material.

Vesicle: Small (<5mm) circumscribed skin blister containing serum.

Bulla: Large(>5mm) vesicle containing free fluid.

Wheal: Irregular elevated edematous skin area, which often changes in size and shape.

Cyst: Enclosed cavity with a membraneous lining which contains liquid or semisolid matter .

Tumor: Large nodule, which may be neoplastic .

Telangiectasia: Dilated superifical blood vessel.

Burrow: A linear or curvilinear papule, caused by a burrowing scabies mite.

Comedone: A plug of keratin and sebum wedged in a dilated pilosebaceous orifice.


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