This patient has this painless lesion on his lower leg. He also has a history 
    of diarrhoea and sore eye.

    a. What does the picture show?

    b. What is the most likely underlying diagnosis?

    c. Why does he get sore eye?
    
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Answers:
 
This patient has this painless lesion on his lower leg. He also has a history 
of diarrhoea and sore eye.

a. What does the picture show?

Pyogenic gangrenosum.
The lesion show ulcerated centre surrounded by dark blue overhanging edges.
b. What is the most likely underlying diagnosis?
Ulcerative colitis
c. Why does he get sore eye?
Anterior uveitis is the most likely cause. However, ulcerative colitis is also asscoaited with episcleritis and scleritis.
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