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Primary Lesions
RAISED LESIONS
FLAT LESIONS
FLUID FILLED (RAISED)
Macule
Flat, circumscribed, discolored, <1cm
For example: freckles, flat nevi, petechia
PATCH
flat, irregular, >1cm (vitiligo)
PAPULE
SOLID, ELEVATED, CIRCUMSCRIBED <1CM
E.G.RAISED NEVUS, WART [VERRUCA]
HINH NGON TAY
PLAQUES
COALESCED (GROUPING TOGETHER) PAPULES, >1CM (PSORIASIS)
NODULE
SOLID, ELEVATED, 1-2CM (LIPOMA = FATTY GROWTH)
TUMOR
LARGER THAN A FEW CENTIMETERS, FIRM OR SOFT (LIPOMA - FAT TUMOR) DOESNT MEAN CANCER, TUMOR CAN BE BENIGN OR MAGLINANT
WHEAL
SUPERFICIAL, RAISED, ERYTHEMATOUS, IRREGULAR (ALLERGIC REASTION, PPD, MOSQUITO BITE) - CAUSES INTERSTITIAL EDEMA <1CM
URTICARIA (HIVES)
WHEALS COALESCE TO FORM EXTENSIVE REACTION; INTENSELY PRURITIC, >1CM
VESICLE
ELEVATED CAVITY WITH CLEAR LIQUID, <1CM (HERPES CIMPLEX, VARICELLA [CHICKEN POX], HERPES ZOSTER [SHINGLES], CONTACT DERMATITIS [E.G., POISON IVY] .. MUN COC NHO
BULLA
ELEVATED CAVITY WITH FLUID, >1CM (CLISTER, BURNS).... MUN COC BU
PUSTULE
CONTAINS PUS, FILLED WITH LEUKOCYTES, NOT NECESSARILY INFECTED (ACNE) ... CREAMY
CYST
ENCAPSULATED FLUID FILLED CAVITY IN DERMIS OR SUB-Q (SEBACEOUS CYST) IF DEEP, MAY BE HARD TO DIFFERENTIATE FROM A NODULE OR TUMOR (E.G. BREAST CYST VERSUS TUMOR)
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