Dermatology 101

Question 0

Solid elevation
0.5 mm or less in diameter

Primary Lesions of the Skin

Answer 0

Papule
Example: mollucum contagiosum, scabies

Primary Lesions of the Skin

Question 1

Circumsized, flat change in color

Primary Lesions of the Skin

Answer 1

Macule
Example: Erythema infectiosum (Fifth Disease)

Primary Lesions of the Skin

Question 2

Raised
Area > elevation above skin surface
Flat top
> 1 cm
Plate like

Primary Lesions of the Skin

Answer 2

Plaque
Example: psoriasis

Primary Lesions of the Skin

Question 3

Raised, solid
> 0.5 <2.0 cm diameter
May be in epidermis, dermis or subcutaneous tissue

Primary Lesions of the Skin

Answer 3

Nodule
Example: Rheumatoid arthritis

Primary Lesions of the Skin

Question 4

Flat-top or rounded elevated lesion
Local dermal edema

Primary Lesions of the Skin

Answer 4

Wheal
Example: urticaria

Primary Lesions of the Skin

Question 5

Raised
<1 cm
Filled with clear liquid

Primary Lesions of the Skin

Answer 5

Vesicle
Examples: Herpes and Hand, foot and mouth disease

Primary Lesions of the Skin

Question 6

Circumscribed
Fluid-filled
> 1 cm

Primary Lesions of the Skin

Answer 6

Bullae
Examples: Stevens-Johnson syndrome, contact dermatitis

Primary Lesions of the Skin

Question 7

Flakes or plates
Compacted desquamated stratum corneum

Secondary Lesions of the Skin

Answer 7

Scale
Example: Tinea capitis, seborrheic dermatitis (cradle cap)

Secondary Lesions of the Skin

Question 8

Small 
Red or purple
Caused by bleeding into the skin
< 3mm
Does not blanch with pressure

Primary Lesions of the Skin

Answer 8

Petechiae
Smallest of three categories of purpuric skin conditions
Common causes: Broken capillary vessels secondary to trauma such as excessive pressure
May be associated with thrombocytopenia

Primary Lesions of the Skin

Question 9

Non-blanching
Red or purple
0.3-1 cm
Bleeding beneath the skin

Primary Lesions of the Skin

Answer 9

Purpura
One of the three categories of purpura
Medium size
Petechiae is the smaller of the 3
Example: Meningicoccal meningitis

Primary Lesions of the Skin

Question 10

Inflammatory purpura is as sign of __________.

Primary Lesions of the Skin

Answer 10

Vascular inflammation (vasculitis)
Non-inflammatory purpura is typically not inflammatory

Primary Lesions of the Skin

Question 11

Give six components used to describe a skin lesion

Answer 11

1. Size
2. Type
3. Shape and symmetry
4. Color and pigmentation
5. Surface features (smooth, rough)
6. Distribution

Question 12

Dried collection of serum and cellular debris

Secondary Lesions of the Skin

Answer 12

Crust
Scab
Impetigo

Yellow when dried serum
Green or yellow-green from purulent exudate
Brown or dark-red when from blood

Secondary Lesions of the Skin

Question 13

Discontinuation of the epithelial lining extending into the epidermis-dermis

Secondary Lesions of the Skin

Answer 13

Ulcer
Example: 
	Arterial ulcer
	Venous ulcer	
	Neuropathic ulcer

Secondary Lesions of the Skin

Question 14

Liner discontinuation/cleavage of the epithelial lining with a sharply demarcated margin
Can extend into the dermis

Secondary Lesions of the Skin

Answer 14

Fissures

May be result of scratching, trauma or infection

Secondary Lesions of the Skin

Question 15

Thinning in epidermis/dermis resulting in skin depression

Secondary Lesions of the Skin

Answer 15

Atrophy
Example: striae

Secondary Lesions of the Skin

Question 16

Thickening of the epidermis with exaggeration of the normal skin lines

Answer 16

Lichenification
Examples:
Eczema

Secondary Lesions of the Skin