| I haven't really had this problem, but what usually works for my students is, when you feel the cheeks puff, play the same passage on the mouthpiece alone. Usually the cheeks stop puffing, then go back to the trumpet. (this isn't a quick fix, it takes some practice and attention). Also, keep the air moving. If you back away with the air, the face will have to do odd things to compensate and probably make you continue to puff.
Occasionally my upper lip puffs out when I play the piccolo. I usually chalk it up to just "one of those things' and it goes away.
Good luck!
Jason.
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"The oboe's A is to make sure we still play it 1 and 2" - Bud Herseth
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