Thursday, September 15, 2016

Description Of Primary Skin Lesions



Description Of Primary Skin Lesions:

1. Macule: A flat, colored lesion, <2 cm in diameter, not raised above the surface of the surrounding skin. A "freckle" or ephelid, is a prototype pigmented macule.


2. Patch: A large ( > 2 cm) flat lesion with a color different from the surrounding skin. 


The difference between a macule and a patch is only in size.


3. Papule: A small, solid lesion, < 0.5 cm in diameter, raised above the surface of the surrounding skin and hence palpable. ( e.g a closed comedone or  white-head, in acne)



4. Nodule: A larger (0.5 -5.0 cm), firm lesion raised above the surface of the surrounding skin. Nodule differs from papule only in size. 


5. Tumor: A solid, raised growth > 5 cm in diameter.


6. Plaque: A large (>1 cm), flat topped, raised lesion, edges may either be distinct ( e.g in psoriasis) or gradually blend with surrounding skin. (e.g in eczematous dermatitits) .




7. Vesicle: A small,fluid filled lesion, < 0.5 cm in diameter, raised above the plane of surrounding skin. Fluid is often visible and the lesions are translucent. 


8. Pustule: A vesicle filled with leukocytes. ( it is important to note that the presence of pustules does not necessarily signify the existence of infection. 


9. Bulla: A fluid filled , raised often translucent lesion > 0.5 cm in diameter.




10. Wheal: A raised, erythematous edematous papule or plaque, usually representing short lived vasodilatation and vasopermeability. 











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