Miscellaneous

Describe the Koebner phenomenon

Development of skin disease at sites of skin trauma

List 3 skin conditions in which the Koebner phenomenon may be seen

1) Psoriasis

2) Lichen planus

3) Vitiligo

Describe the Nikolsky sign

Skin blistering with application of gentle mechanical pressure on the skin – either of on the edge of an existing lesion or on normal skin

What skin condition may occur in Coeliac disease?

Dermatitis herpetiformis

Which condition may be associated with pyoderma gangrenosum?

Inflammatory bowel disease

What is an important dermatological complication of immunosuppressants?

Malignancy, particularly squamous cell carcinoma (SCC)

What skin condition is typically seen in Lyme disease?

Erythema chronic migrans

What skin lesions can tuberculosis (TB) cause?

Erythema nodosum

What skin lesions can be seen in typhoid?

Rose spots

What is the typical appearance of erythema multiforme?

‘Target’ lesions

Which 2 skin conditions are the commonest causes of erythroderma?

1) Psoriasis

2) Eczema (atopic dermatitis)

Within what time period do urticarial lesions usually resolve?

Within 24 hours

In pemphigus vulgaris where is the commonest site of mucosal lesions?

Oral cavity

Which 3 dermatological conditions may occur as extra-hepatic manifestations of hepatitis C infection?

1) Porphyria cutanea tarda

2) Lichen planus

3) Necrolytic acral erythema

Which inflammatory bowel disease is the commoner cause of erythema nodosum?

Crohn’s disease

(more often than ulcerative colitis)

Which organism is the commonest cause of erythema nodosum?

Streptococcus

Which organism is the commonest cause of impetigo?

Staphylococcus aureus

Which organism is the commonest cause of erythema multiforme?

Herpes simplex virus