Intro to Derm -Connett

Question 1

What is a circumscribed, flat discoloration that may be brown, blue, red or hypo pigmented called?

Answer 1

Macule (primary lesion)

Question 2

What is an elevated solid lesion up to 0.5 cm in diameter called? What can these form if they become confluent?

Answer 2

papule

If confluent==> plaque

Question 3

What is a nodule? How is this different from a papule? What is a large nodule called?

Answer 3

a nodule is a circumscribed, elevated solid lesion > 0.5 cm in diameter

a papule is < 0.5 cm

a large nodule=tumor

Question 4

*Name this skin lesion:
A circumscribed, elevated, superficial, solid lesion more than 0.5 cm in diameter, often formed by the confluence of papules. What condition is this often seen in?

Answer 4

Plaque

often seen in psoriasis (red scaly, well-defined, thick, circular plaques)

Question 5

Name this skin lesion:
A circumscribed collection of leukocytes and free fluid that varies in size

How is this different from a vesicle?

Answer 5

pustule

a vesicle is a circumscribed collection of free fluid up to 0.5 cm in diameter (NO leukocytes)

Question 6

How does a bulla differentiate from a vesicle?

Answer 6

a vesicle=< 0.5 cm

bulla=>0.5 cm

both are filled with free fluid

Question 7

What is a wheal?

Answer 7

A transient, firm, edematous plaque resulting form the infiltration of the dermis with fluid
This is normally pink and blanchable

Question 8

What are some examples of secondary lesions?

Answer 8

crust, scale, erosions, ulcers, fissures, atrophy, scar, Lichenification

Question 9

What is the name for a collection of dried serum and cellular debris?

Answer 9

Crust (or scab)

Question 10

What is the name for excess dead epidermal cells that are produced by abnormal keratinization and shedding?

Answer 10

scales

seen in psoriasis and desquamation of scarlet fever

Question 11

What is an erosion? Does this lead to scarring?

Answer 11

A focal loss of epidermis

erosions do not penetrate below the dermoepidermal junction –> heal without scarring

Question 12

What is the name of a linear loss of epidermis and dermis with sharply defined, nearly vertical walls?

Answer 12

Fissure

Question 13

What is a depression in the skin from thinning dermis or epidermis called?

Answer 13

atrophy

Question 14

What is a scar? What does this imply? What do these generally look like?

Answer 14

an abnormal formation of connective tissue

implies dermal damage

initially thick and pink but become white and atrophic

Question 15

What is the name of an area of thickened epidermis induced by scratching? The skin lines are accentuated so the surface looks like a washboard?*

Answer 15

Lichenificaiton

Question 16

What is the name for an erosion caused by scratching?

Answer 16

excoriation

Question 17

What is a comedone?

Answer 17

a plug of sebaceous and keratinous material in the opening of a hair follicle

black head

Question 18

What is a milia?

Answer 18

A small, superficial keratin cyst with no visible opening

Question 19

What is a cyst?

Answer 19

A circumscribed lesion with a wall and a lumen

the lumen may contain fluid or solid matter

(examples: pilar cyst and epidermal cyst)

Question 20

What is the name for a circumscribed deposit of blood less than 0.5 cm in diameter? Does this lesion blanch?

Answer 20

Petechiae

NO!

Question 21

What is the difference between petechiae and purpura?

Answer 21

purpura is a circumscribed deposit of blood > 0.5 cm in diameter

Petechiae < 0.5 cm

Question 22

What is the name for a narrow, elevated, tortuous channel produced by a parasite? What can cause this?

Answer 22

Burrow

Scabies!