Dermatology Cheat Sheet

Question 1

Leg ulcers with ABPI >0.8 Mx?

Answer 1

Graduated compression

Question 2

ABPI of 0.4 Mx?

Answer 2

Refer to vascular surgeon

Question 3

Psoriasis skin changes?

Answer 3

Absent granular layer, hyperproliferation of keratinocytes

Question 4

Woman with multiple lumps on her back. Been there for years - wants them checked out. Asymptomatic, well-defined, “stuck-on” warty appearance. Mx?

Answer 4

Reassure - no Tx required. (Seborrhoeic keratosis)

Question 5

Linear IgG + complement in BM on IF?

Answer 5

Pemphigoid

Question 6

Herald patch, Fir tree appearance, Dx?

Answer 6

Pityriasis Rosea - self-limiting, disappears in 6-12 weeks

Question 7

Next step in someone with a skin lesion question???

Answer 7

No answer given. Refer to derm?

Question 8

Derm lesion descriptions

Answer 8

•	When describing a rash state: 
o	Location. 
o	Distribution. 
o	Colour. 
o	Border
. 
•	Macule: hyper pigmented flat lesion <1cm. 
•	Patch: hyper pigmented flat lesion >1cm. 

• Papule: raised, well defined lesion <0.5cm.
• Nodule: raised, well defined lesion >0.5cm.
• Plaque: raised, flat top lesions that grow horizontally and >1cm.
• Vesicle: fluid filled lesion < 0.5cm.
• Bulla: fluid filled lesion >0.5cm.
• Pustule: pus filled lesion.
• Cyst: Nodule with semi solid material.
• Erosion: superficial skin break in the epidermis.
• Ulcer: deep skin break that extends down to the dermis.
• Fissure: horizontal split in epidermis.
• Lichenification: increased appearance of skin markings.
• Crust: yellow / brown exudate.
• Scale: Dry fragments of skin.
• Erythema: reddening of skin.
• Purpura: purple discoloration due to damage to blood vessels.

Question 9

Hyperkeratosis and Munro abscesses, Dx?

Answer 9

Psoriasis

Question 10

Tx of Bowen’s disease?

Answer 10

Management options:
Topical 5-fluorouracil or imiquimod
Cryotherapy
Excision

Question 11

Lentigo Maligna - a type of melanoma-in-situ

Answer 11

Older woman with dark patch on sun-exposed skin most her life

Question 12

Painful, red, ulcerating nodules with violaceous borders which become inflamed and indurated and characteristically have an undermined edge, starts as pustules and these coalesce and form a large necrotic ulcerating lesion. 50% of cases are idiopathic but common associations are IBD, RA and seronegative arthropathies, and leukaemias

Answer 12

Pyoderma gangrenosum

Question 13

Vascular lesion that occurs on both mucosa and skin and appears as an overgrowth of tissue due to irritation, physical trauma, or hormonal factors

Answer 13

Pyogenic granuloma

Question 14

Exclamation mark hair. Dx?

Answer 14

Alopecia areata

Question 15

Red rash, flexor surface of forearm, very itchy, Dx?

Answer 15

Lichen Planus - Think of the P’s - Pruritic, purple, papular, polygonal, oral involvement, striae, flexor surfaces

Question 16

Itchy, blistering rash, sore abdominal pain, change in bowel habits, Dx?

Answer 16

Dermatitis herpetiformis - linked to coeliac, tTG antibodies, IgA deposits, Tx = Dapsone

Question 17

Child, itchy at night, excoriations only, Dx?

Answer 17

Scabies. Tx = Permethrin 1st, Malathion 2nd

Question 18

Woman, ankle ulcer just healed, ABPI good on both legs, further Mx?

Answer 18

Compression stockings apparently

Question 19

Man, leg ulcer, ABPI 2.7, known arteriopathy with mixed disease, Mx?

Answer 19

Basic wound care? Refer for amputation? 1.5

Question 20

1-2cm ulcer on leg, slowly growing, next step in Ix?

Answer 20

Biopsy

Question 21

Slapped cheek classic description - what is causative organism?

Answer 21

Parvovirus B19

Question 22

Girl with herpes on lip - Ix?

Answer 22

Swab for viral PCR?

Question 23

Ix for boy with lesion between toe, then got erythematous round lesion with crusting at edges.

Answer 23

Sounds fungal - skin scraping

Question 24

Impetigo Ix?

Answer 24

Bacterial swab - usually caused by staph aureus

Mx - topical fusidic acid, oral flucloxacillin next step

Question 25

Target lesions

Answer 25

Erythema multiforme

Question 26

Histology of warts, psoriasis and pemphigus

Answer 26

Look up. Also of palms vs armpits vs scalp etc

Question 27

Build up of what in porphyria cutanea tarda?

Answer 27

Uroporphyrinogen decarboxylase

Question 28

Crying child in direct sunlight?

Answer 28

Erythropoietic protoporphyria

Question 29

1st line Tx for Acne rosacea?

Answer 29

Topical metronidazole

Question 30

1st line Tx for Acne vulgaris?

Answer 30

Benzoyl peroxide or topical clindamycin

Question 31

What is epidermolysis bullosa?

Answer 31

Breakdown of anchoring between the epidermis and dermis

Question 32

Had images of SCC, basal cell papilloma, and dermatofibroma

Answer 32

Look up

Question 33

NF1 Dx?

Answer 33

Clinical:
Café-au-lait spots (>= 6, 15 mm in diameter)
Axillary/groin freckles
Peripheral neurofibromas
Iris hamatomas (Lisch nodules) in > 90%
Scoliosis
Pheochromocytomas

Doesn’t have to be a family history as can occur from gene mutations

Question 34

Question on which of the following is true; then gave statements about lotions/creams/ointments e.g. “lotions are good for dry conditions such as eczema”

Answer 34

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