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Flashcards in dermatology Deck (11):

secondary lesion

-changes in primary lesion
-usually resulting of more systemic illness i.e. psoriasis


criteria of lesion

morphologic features, configuration, and distribution


primary lesions
non palpable, flat

macule: 1 cm; vitiligo, cafe au lait spots


primary skin lesions
palpable, solid mass

papule: 2 cm; neoplasms
plaque: flat, elevated, superficial papule with surface area> than height; psoriasis, seborreickeratosis
wheal: superficial area of cutaneous edema; hives, insect bites


primary lesions
palpable, fluid filled

vesicle: 1 cm, filled with serous fluid; blister, pemphigus vulgaris
pustule: filled with pus; acne, impetigo


special primary lesions

cornedo: plugged opening of sebaceous gland; blackhead
burrow: >10 mm, raised tunnel; scabies
cyst: palpable lesion filled with semiliquid material or fluid; sebaceous cyst
abscess: localized accumulation of purulent material in dermis or subcutis-usually pus so deep unable to visualize from surface
furuncle: necrotizing form or inflammation of hair follicle
carbuncle: coalescence of several furuncles
milia: keratin-filled cysts on distal part of sweat gland


secondary lesion
below skin plane

erosion: loss of part/all of epidermis, surface is moist; rupture of vesicle
ulcer: loss of epidermis and dermis, may bleed; stasis ulcer, chancre
fissure: linear cracks from epidermis to dermis; cheilitis, athlete's foot
excoriation: superficial linear, "duggout", traumatized area, usually self-induced; abrasion, scratch
atrophy: thinning of skin with loss of skin markings; striae
sclerosis: diffuse or circumscribed hardening of skin


secondary lesion
above plane

scaling: heaped-up keratinized cells, exfoliated epidermis; dandruff, psoriasis
crusting: dried residue of pus, serum, or blood; scabs, impetigo


vascular skin lesions

erythema: pink/red blanchable discoloration of skin secondary to dilation of blood vessels
petechiae: nonblanchable, .5 cm; intravascular defects
ecchymosis: nonblanching, variable in size; trauma, vasculitis
telangiectasia: fine, irregular dilated blood vessels; dilation of capillaries
spider angioma: central red body with radiating spider-like arms; liver disease, estrogens


miscellaneous skin lesion

scar: replacement of destroyed dermis by fibrous tissues, may be atrophic or hyperplastic; healed wound
keloid: elevated, enlarging scar growing beyond boundaries of wound; burn scars
lichenification: roughening/thickening of epidermis, accentuated skin markings; atopic dermatitis


primary lesion

-first response of body to skin
-result from anatomical changes in skin