16 Skin Pathology and cutaneous lesions Flashcards
crust
collection of dried serum and cellular debris, (scab) eczema, impetigo, seborrhea
cyst
thick-walled, closed sac or pouch containing fluid or semisolid material (pilonidal cyst, sebaceous cyst)
erosion
wearing away or loss of epidermis
fissure
groove or crack like sore
macule
flat lesion measuring less than 1 cm in diameter. freckles, tattoo marks, flat moles
nodule
solid, round oval elevated lesion 1 cm or more in diameter. enlarged lymph nodes or solid growth
papule
small (less than 1cm in diameter), solid elevation of skin. pimples
polyp
growth extending from the surface of mucous membrane
pustule
papule containing pus. small abscess on the skin
ulcer
open sore on the skin or mucous membrane (deeper than erosion) decubitus ulcer-laying in place to long
vesicle
small collection (papule) of clear fluid (serum); blister. form in burns, allergies, dermatitis. bulla- large vesicle
wheal
smooth, edematous (swollen) papule or plaque that is redder or paler than the surrounding skin. hives, anaphylaxis, insect bites
alopecia
absence of hair from areas where it normally grows
ecchymosis, ecchymoses
bluish-purplish mark (bruise) on the skin (ec-=out, chym/o=pour) caused by hemorrhages into the skin
petechia, petechiae
small, pinpoint hemorrhage
pruritus
itching
urticaria (hives)
acute allergic reaction in which red, round wheals develop on the skin
acne
chronic papular and pustular eruption of the skin with increased productions of sebum (acne vulgaris)
burns
injury caused by heat 1st-superficial no blisters, 2nd-epidermal and dermal, blisters, hyperesthesia. 3rd- epi and derm destroyed, subq layer damaged leaving charred, white tissue
cellulitis
diffuse, acute infection of the skin marked by local heat, redness, pain, and swelling
eczema
inflammatory skin disease with erythematous, papulovesicular lesions
exanthematous viral disease
rash (exantehm) of the skin due to viral infection (rubella, rubeola, varicella)
gangrene
death of tissue associate with loss of blood supply
impetigo
bacterial inflammatory skin disease characterized by vesicles, pustules, and crusted over lesions. contagious pyoderma