DERMA

Question 1

Cocks peculiar tumor

Answer 1

Infected and ulcerated sebaceous cyst

Question 2

Some features of sebaceous cysts

Answer 2

Have central punctum
Mostly contain sebum
Most common scalp, ears, back, face, and upper arm (not palms of the hands and soles of the feet).

Question 3

What can cause reoccurence of sebaceous cyst

Answer 3

Excision of the cyst wall needs to be complete to prevent recurrence

Question 4

Most common cause of acanthosis nigricans

Answer 4

Insulin resistance

Question 5

Long standing nonhealing ulcer on medial malleolus
What to do

Answer 5

Perform punch biopsy

Question 6

If suspected melanoma/pigmented lesions
What not to do

Answer 6

Don’t perform incisional biopsy
Perform excisional biopsy

Question 7

SCC Of skin is associated with which premalignant conditions

Answer 7

Pre-malignancy conditions, such as Bowen’s disease or actinic keratoses

Question 8

Squamous cell carcinoma in situ
Also known as

Answer 8

Bowen disease

Question 9

How to differentiate between melanoma vs SCC

Answer 9

immunohistochemistry with S100

Question 10

Basosquamous carcinoma feature

Answer 10

Basaloid histological BCC features with eosinophillic squamoid features of SCC

Question 11

Risk factor for Basal cell carcinoma

Answer 11

Xeroderma Pigmentosa or Gorlin syndrome).
psoriasis, Fitzpatrick type 1 skin, immunosuppression

Question 12

Dome shaped erythematous lesions that develop over a period of days and grow rapidly. They often contain a central pit of keratin.

Answer 12

Keratoacanthoma

Question 13

Rx of Keratoacanthoma and pyogenic granuloma

Answer 13

curettage and cautery

Question 14

Sun exposure pattern in SCC vs BCC

Answer 14

For SCC’s the major pattern is in chronic long term exposure. For BCC’s, the pattern of sporadic exposure with episodes of burning is more important.

Question 15

Whixh viral DNA is found in the majority of transplant recipient SCC’s

Answer 15

Human papilloma virus

Question 16

Sebum in cyst with outer root sheath of hair follicle

Answer 16

Pilar cyst

Question 17

raised pearly edges in an ulcerated lesion at a sun exposed site

Answer 17

BCC

Question 18

Diagnostic point for PYOGENIC GRANULOMA

Answer 18

Trauma is a common precipitant of pyogenic granuloma and contact bleeding and ulceration are common

Question 19

treatment for an infected sebaceous cyst is

Answer 19

incision and drainage with removal of the cyst wall.

Question 20

Dermoid cyst features

Answer 20

Have hair
Midline
Dumbell shaped

Question 21

Skin lesion associated with Crohns vs celiac

Answer 21

Crohn : pyoderma gangrenosum
Celiac: dermatits herpatiformis

Question 22

Which lesion feel larger than it appears

Answer 22

Dermatofibroms

Question 23

Dermatofibroma features

Answer 23

may be pigmented
are often larger than they appear.
They frequently occur at sites of previous trauma.

Question 24

What mutation in atypical naevi

Answer 24

CDKN2A gene

Question 25

Spitz naevus is common in which age group

Answer 25

Children

Question 26

Junctional melanocytic naevi features

Answer 26

Circular macules
May have heterogeneous colour even within same lesion
palms, soles and mucous membranes are

Question 27

Which lesion is heterogenous in appearance

Answer 27

Junctional melanocytic naevi

Question 28

scaly, thick, greasy surface with scattered keratin plugs
Dx

Answer 28

Seborrheic keratosis

Question 29

skin lesions most likely to resemble a malignant melanoma?

Answer 29

Spitz naevi
Thus remove them

Question 30

seborrhoeic warts features

Answer 30

Itchy pigmented lesions mostly over trunk

Question 31

seborrhoeic warts Rx

Answer 31

lesions are often extensive and superficial. Shave excision will suffice, material must be sent for histology