Curiosity has created stains on my brain

WHILE reading through my correspondence in the practice the other day, I came across a letter from a surgeon to whom I had recently sent a patient for a colonoscopy. 

(As an aside, I had a mate at uni called Colin, and we always referred to him as Colin Oscopy. Still makes me laugh.

There was another bloke in my year called Eric, but the surname Tiledysfunction never sounded quite as plausible.) 

Anyway, the colonoscopy report described a number of bowel lesions consistent with blue rubber bleb naevus syndrome. Blue rubber what? The way