Skin Lesions

Front 1

Macule

Back 1

a circumscribed, flat discoloration < 0.5 cm diameter

Front 2

Patch

Back 2

a circumscribed, flat discoloration > 0.5 cm diameter

Front 3

Petechiae

Back 3

a circumscribed deposit of blood < 0.5 cm diameter

Front 4

Purpura

Back 4

a circumscribed deposit of blood > 0.5 cm diameter

Front 5

Infarct

Back 5

an area of necrosis resulting from a sudden insufficiency of arterial or venous blood supply

Front 6

Sclerosis

Back 6

induration (hardness or firmness caused by chronic inflammation)

Front 7

Telangiectasia

Back 7

dilated superficial blood vessels

Front 8

Papule

Back 8

a palpable lesion up to 0.5 cm diameter

Front 9

Plaque

Back 9

a circumscribed, palpable, solid lesion more than 0.5 cm diameter often formed by the confluence of papules

Front 10

Nodule

Back 10

a circumscribed, often round, solid lesion more than 0.5 cm in diameter

Front 11

Wheal

Back 11

a transient, firm, edematous papule or plaque resulting from infiltration of the dermis with fluid. These should come and go. It can be gone in an hour even. Changing rapidly is key. If they last for days it maybe something else like cellulitis.

Front 12

Vegetation

Back 12

any outgrowth from the surface

Front 13

Papilloma

Back 13

a benign epithelial neoplasm consisting of villous (hair-like or arborescent (dendritic outgrowths of fibrovascular stroma covered by neoplastic cells)

Front 14

Vesicle

Back 14

a circumscribed collection of free fluid up to 0.5 cm in diameter.

Can usually see the fluid underneath. Almost like you could put a needle in it and pop it.

Front 15

Bulla

Back 15

a circumscribed collection of free fluid > 0.5 cm in diameter

Front 16

Pustule

Back 16

a circumscribed collection of leukocytes and free fluid that varies in size

Front 17

Abscess

Back 17

a circumscribed collection of pus appearing in acute or chronic localized infection, and associated with tissue destruction and frequently with swelling.
Can be in dermis, subcutaneous tissue...

Front 18

Cyst

Back 18

an abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining. The key is they have some sort of substance that can be identified.

Front 19

Exudate

Back 19

crusts or scabs (a collection of dried serum and cellular debris)

Front 20

Scales

Back 20

small, thin plates of horny epithelium resembling a fish scale being cast off from the skin.

Front 21

Scar

Back 21

an abnormal formation of connective tissue implying dermal damage secondary to injury or surgery. Initially thick and pink but with time become white and atrophic.

Front 22

Lichenification

Back 22

an area of thickened epidermis induced by scratching. The skin lines are accentuated so that the surface looks like a washboard.

Front 23

Hypertrophy

Back 23

general increase in bulk not due to tumor formation.

Front 24

Burrow

Back 24

a narrow, elevated tortuous channel produced by a parasite.

Front 25

Comedo

Back 25

a plug of sebaceous and keratinous material lodged in the opening of a hair follicle. The follicular orifice may be dilated (blackhead) or narrowed (whitehead or closed comedo).

Front 26

Milia

Back 26

a small, superficial keratin cyst with no visible opening.
1 - 2 mm; very small. Karatin filled cysts.

Front 27

Atrophy

Back 27

thinning of the epidermis or dermis

Front 28

Sclerosis

Back 28

induration (hardness or firmness caused by chronic inflammation)

Front 29

Erosion

Back 29

a focal loss of epidermis that does not penetrate the dermoepidermal junction and therefore heals without scarring (one step before scaring) Dermis hasn't been effected.

Front 30

Excoriation

Back 30

an erosion (often linear caused by scratching)

Front 31

Fissure

Back 31

a linear loss of epidermis and dermis with sharply defined, nearly vertical walls

Front 32

Scar

Back 32

an abnormal formation of connective tissue implying dermal damage secondary to injury or surgery. Initially thick and pink but with time become white and atrophic.

Front 33

Ulcer

Back 33

a focal loss of epidermis and dermis that heals with scarring

Front 34

Sinus

Back 34

a fistula or tract leading to a suppurating cavity

Front 35

Gangrene

Back 35

necrosis due to obstruction, loss or diminution of blood supply

Front 36

Sphacelus

Back 36

a mass of sloughing, gangrenous, or necrotic matter.

Front 37

Linear

Back 37

(vesicles, papules: contact dermatitis, psoriasis, lichen planus)

Front 38

Grouped

Back 38

(vesicles, papules: herpetiform, zosteriform, insect bites

Front 39

Annular

Back 39

(scaling: tinea corporis, secondary syphilis)

Front 40

Geographic

Back 40

(wheals, plaques: urticaria, mycosis fungoides)