Dermatology

Question 1

What is Erythema Ab Igne?

Answer 1

Erythema ab igne is a skin disorder caused by over exposure to infrared radiation. Characteristic features include reticulated, erythematous patches with hyperpigmentation and telangiectasia. A typical history would be an elderly women who always sits next to an open fire.

Question 2

What is a possible complication of Erythema Ab Igne, if left untreated?

Answer 2

Develops into squamous cell skin cancer

Question 3

What is polymorphic eruptions of pregnancy?

Answer 3

pruritic condition associated with last trimester
lesions often first appear in abdominal striae
management depends on severity: emollients, mild potency topical steroids and oral steroids may be used

Question 4

What is pemphigoid gestationis?

Answer 4

pruritic blistering lesions
often develop in peri-umbilical region, later spreading to the trunk, back, buttocks and arms
usually presents 2nd or 3rd trimester, rare in 1st
oral corticosteroids are usually required

Question 5

What are the features of scabies?

Answer 5

widespread pruritus
linear burrows on the side of fingers, interdigital webs and flexor aspects of the wrist
in infants the face and scalp may also be affected
secondary features are seen due to scratching: excoriation, infection

Question 6

What is the management for scabies?

Answer 6

permethrin 5% is first-line
malathion 0.5% is second-line
pruritus persists for up to 4-6 weeks post eradication

Question 7

What are the features of pyoderma gangrenosum?

Answer 7

Typically on the lower limbs
initially small red papule
later deep, red, necrotic ulcers with a violaceous border
may be accompanied systemic symptoms e.g. Fever, myalgia

Question 8

What are the causes for pyoderma gangrenosum?

Answer 8

idiopathic in 50%
IBD, RA, SLE,
myeloproliferative disorders, lymphoma, myeloid leukaemias, monoclonal gammopathy (IgA)
primary biliary cirrhosis

Question 9

What are the main features of bullous pemphigoid?

Answer 9

itchy, tense blisters typically around flexures
the blisters usually heal without scarring
mouth is usually spared*

Question 10

What is Bullous Pemphigoid?

Answer 10

autoimmune condition causing sub-epidermal blistering of the skin
immunofluorescence shows IgG and C3 at the dermoepidermal junction

Question 11

What is Pityriasis versicolor?

Answer 11

Also called tinea versicolor

superficial cutaneous fungal infection caused by Malassezia furfur (formerly termed Pityrosporum ovale)

Question 12

What is Acanthosis Nigricans?

Answer 12

Skin disorder characterised by hyper pigmentation and hyper keratosis, occurring mainly in the folds in the axilla, groin and back of the neck

Question 13

What is the management for Acne Rosacea?

Answer 13

Mild/moderate - topical metronidazole

Severe/resistant - oral tetracycline

Question 14

What is the management for seborrhoeaic dermatitis in adults?

Answer 14

Zinc pyrithione (head & shoulders) and tar (Neurogena T/gel)

2nd line - ketoconazole

Question 15

What is the management for athletes foot? (Tinea Pedis)

Answer 15

Topical imidazole
Undecenoate
Terbinafine

Question 16

Which drugs can cause erythema multiforme?

Answer 16

Penicillin
Sulphonamides
Carbamazepine
Allopurinol
NSAIDs
COCP
Nevirapine