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19 terms

HA Mod 4 Objectives

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discrete arrangement of lesions
lesions individual, separated and distinct
Confluent arrangement of lesions
lesions merge and run together
Grouped arrangement of lesions
lesions are clustered
Annular configuration
circular; begins in center and spreads to periphery
Polycyclic configuration
annular lesions grow together
Gyrate
twisted, coiled, spiral snakelike
Zosteriform
linear arrangement along a nerve route
Macule
flat, nonpalpable, but visually distinct, with color different from normal skin, <1cm; ex. freckles, flat nevi
Patch
macules that are larger than 1cm; ex. mongolian spots, vitiligo
Papule
raised, solid lesion <1cm, ex. wart, elevated nevi
Plaque
papules that coalesce to form surface elevation wider than 1cm; ex. psoriasis
Nodule
solid, elevated, hard or soft, larger than 1cm; May extend deeper into dermis than papule
Tumor
larger than a few cm in diameter, firm or soft, deeper into the dermis; may be benign or malignant, although most people think of cancer
Wheal
superficial, raised, transient, and erythmatous, slightly irregular shape due to edema (fluid held diffusely in the tissues); ex. TB skin test, hives
Vesicle
BLISTER; elevated cavity containing free fluid; up to 1cm; clear serum flows if wall is ruptured
Bulla
larger than 1cm; usually single chambered; superficial in epidermis; thin walled, so it ruptures easily; ex. chicken pox, shingles
Pustule
Turbid fluid (pus) in cavity; circumscribed and elevated; ex. acne (previous test question!!)
Cyst
encapsulated fluid-filled cavity in dermis or subcutaneous layer, intensely elevating skin
Telangiectasia
Fine, irregular red lines caused by capillary dilation