Derm

Question 1

Keratoacanthoma

Answer 1

Keratoacanthoma is a benign epithelial tumour

Features - said to look like a volcano or crater
initially a smooth dome-shaped papule

rapidly grows to become a crater centrally-filled with keratin

Spontaneous regression of keratoacanthoma within 3 months is common, often resulting in a scar

Such lesions should however be urgently excised as it is difficult clinically to exclude squamous cell carcinoma

Removal also may prevent scarring

Question 2

Definition of Erythroderma

Answer 2

Erythroderma is a term used when more than 95% of the skin is involved in a rash of any kind

Known as ‘red man’ syndrome

Question 3

Causes of erythroderma

Answer 3

Causes of erythroderma

• eczema
• psoriasis
• drugs e.g. gold
• lymphomas, leukaemias
• idiopathic

Question 4

Causes of Erythema nodosum

Answer 4

• infection
  
  • streptococci
  • tuberculosis
  • brucellosis
• systemic disease
  
  • sarcoidosis
  • inflammatory bowel disease
  • Behcet’s
• malignancy/lymphoma
• drugs
  
  • penicillins
  • sulphonamides
  • combined oral contraceptive pill
    
    • pregnancy

Question 5

What is the single most important factor in determining prognosis of patients with malignant melanoma

Answer 5

The invasion depth of a tumour (Breslow depth)

Question 6

Kerion defintion

Answer 6

kerion is a fungal abscess on the scalp