Derm

Question 1

Erythema multiforme

Answer 1

Target lesion with surrounding red ring
Drug: penicillin, sulphonamides, barbituates
Infection: HSV, coxsackie virus, typhoid, atypical pneumonia e.g. Mycoplasma, TB,
Idiopathic
Pregnancy

Question 2

Erythema nodosum

Answer 2

Drugs: sulphonamides, OCP, barbituates
Infection: streptococcal, TB, invasive fungal
AI: IBD, sarcoidosis, SLE
Idiopathic

Question 3

Erythema migrans

Answer 3

Lyme disease

Question 4

Erythema toxicum

Answer 4

Benign
Small pustule/vesicles surrounded by erythema
Newborns: 1st 2 weeks

Question 5

Erythema marginatum

Answer 5

Rheumatic fever

Question 6

Complications eczema

Answer 6

Cellulitis: bacterial superinfection
Usually: g +ve cocci, staph + strep
Eczema herpeticum

Question 7

Naevus flammeus

Answer 7

Port wine stain
Capillary vascular malformation in the dermis
Present from birth will persist for life
Trigeminal distribution seen with underlying brain involvement in small number Sturge-Weber syndrome - req MRI to rule out

Question 8

Strawberry naevi

Answer 8

Aka cavernous haemangioma
Not present at birth, appears in 1st month
Will grow large before shrinking and disappearing by age 5
Not flat
May ulcerated / compress nearby structures

Question 9

Stork bite

Answer 9

Aka capillary haemangioma
Pink macule
Eye lids/?central forehead, nape of neck
Distension of dermal capillaries
Mostly fade over first year

Question 10

Management of eczema

Answer 10

Topical emollient
Topical steroid
Bandages
Phototherapy
Systemic steroids
Tacrolimus

Question 11

Guttate psoriasis

Answer 11

Children + young adults
Oval scaling red papules + plaques
Torso + proximal extremities
Preceded by strep infections

Question 12

Classical psoriasis

Answer 12

Well demarcated erythematous papules + plaques with a scaly surface
Exacerbations due to: infections, stress, trauma, medications