Aphthous stomatitis (Canker sore). shallow ulcer with a white or yellow center and red border; seen on the inner side of the lip and cheeks or on the tongue; it begins with a burning or tingling sensation and slight swelling; painful; usually lasts 7-10 days and heals without a scar. î î î.
It was all a cheap publicity stunt. One of the regulation features of early ballparks, supposedly, was a gigantic billboard advertising Bull Durham tobacco, inevitably located out in left field, near the pitchers' warm-up area. Hence the bullpen was the pen near the Bull. (Which, frankly, sounds like a lot of bull to me.)
The bullpen looks like a bull pen. That is to say, the area set aside for practicing pitchers looks like the fenced-in spot where fighting bulls were kept before bullfights and rodeos. Veteran fans will recall the similarity between Fernando Valenzuela in the heat of warm-up and an enraged bovine preparing to charge.