Cutaneous Gross Anatomy

Question 1

9 primary lesions

Answer 1

Macule
Patch
Papule
Plaque
Vesicle
Bulla
Pustule
Nodule
Cyst

Question 2

Macule

Answer 2

Flat, non palpable

1 cm or LESS in diameter

Question 3

Patch

Answer 3

Flat, non palpable
> 1cm diameter
Arises de novo or through coalescence of macules

Question 4

Papule

Answer 4

Elevated, solid, palpable

1 cm or LESS in diameter

Question 5

Plaque

Answer 5

Elevated, solid, palpable
> 1cm in diameter
Arises de novo or as the result of coalescence of papules

Question 6

Vesicle

Answer 6

Liquid or fluid filled (ie blisters)
1 cm or LESS in diameter
Grouped vesicles on an erythematous base = herpes

Question 7

Bulla

Answer 7

Liquid or fluid filled (ie blisters)

> 1 cm in diameters

Question 8

Pustule

Answer 8

Pus containing

Usually small, but can coalesce

Question 9

Nodule

Answer 9

Solid, palpable with significant depth
Usually > 1cm and extend into the dermis and/or subcutis
Have to touch the skin to determine this - cannot determine depth from a picture

Question 10

Cyst

Answer 10

Sac containing fluid or semisolid material (cells or cell products)
Usually in the dermis/subcutis
Fluctuant (can feel the fluid in it)

Question 11

Wheals/hives

Answer 11

Transient (<24 hours) well circumscribed papules or plaques seen in urticaria
Due to dermal edema
Usually puritic

Question 12

Telangiectasis

Answer 12

Dilated superficial dermal vessel

Question 13

Comedome

Answer 13

Dilated pore with keratinous debris

Can be open (blackhead) or closed (whitehead)

Question 14

Milium

Answer 14

Small superficial cyst containing keratin

Usually < 1-2 mm in size

Question 15

Burrow

Answer 15

Small threadlike curvilinear papule that is virtually pathognomonic of scabies

Question 16

Primary lesion definition

Answer 16

Lesions that appear as a direct result of the pathologic process

Question 17

Secondary lesion definition

Answer 17

Lesions that appear as a result of alteration or evolution of a primary lesion

Question 18

Erosion vs ulcer

Answer 18

Erosion is a superficial open wound (loss of epidermis or mucosa only). Usually heals without scarring
Ulcer is a deeper open wound with partial or complete loss of dermis or submucosa. Usually heals with scarring

Question 19

Hypertrophic scar vs keloid

Answer 19

Hypertrophic scars do not overgrow the original wound boundaries
Keloids will extend well beyond wound boundaries

Question 20

Green toenails suggests

Answer 20

Pseudomonas infection