Primary lesions

Question 1

Macule

Answer 1

Flat, circumscribed, less than 1 cm
Freckles, petechiae

Question 2

Patch

Answer 2

Flat, circumscribed, greater than 1 cm
Mongolian spots
port wine stains

Question 3

Plaque

Answer 3

Circumscribed, greater than 1 cm
Commonly formed by collection of papules
Psoriasis,
atopic dermatitis,
Tinea corporis (ring worm)

Question 4

Nodule

Answer 4

Circumscribed, elevated, solid lesion, 0.5-2cm
Nevi
fibromas
Hemangioma
Pyogenic granuloma

Question 5

Cyst

Answer 5

elevated, lesion in dermis
cyst acne, sebaceous cyst

Question 6

Vesicle

Answer 6

Elevated, fluid containing, <0.5cm
herpes, varicella

Question 7

Bulla

Answer 7

Elevated, fluid-filled, translucent walls, greater than 1 cm
blister,
contact dermatitis,
Pemphigus vulgaris

Question 8

Wheel

Answer 8

Solid elevation, blanches with pressure
allergic reaction,
urticaria(hives)

Question 9

Comedones

Answer 9

Plugged secretions of horny material, retained within pilosebaceous follicle
White heads
Black heads
acne

Question 10

Burrows

Answer 10

Tunneling of animal parasite
scabies

Question 11

Telangiectasia

Answer 11

Fine irregular red lines produced by capillary dilation
rosacea

Question 12

Papule

Answer 12

Palpable, circumscribed elevated lesions less than 1cm

Insect bites
Elevated moles
Warts
Molluscum contagiosum