It's like I've overstretched it or something - it's just the inner side of my finger, towards the middle joint.
I have small hands and fingers, which means that I can't curve them round properly,which I think has caused the problem. It might also be because I'm concentrating hard, and gripping the oboe too tightly?
I'm adapting my typing at the moment to ensure that I don't exacerbate the problem. I guess there isn't anything I can do - perhaps I'll get used to it with time.
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But then if you are an oboe newbie how come you are spending so much time doing trills that you have hurt your finger? Shouldn't you be doing "easy" stuff like me?
It's particularly galling that I haven't really practised it at all yet - it's just from playing a new piece in my lesson. Outside of a couple of trills in the first line, it doesn't seem like a difficult piece - fits under the fingers and there are lots of nice places to breathe. Who knows, I can always come back to it later if it's beyond me.
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I find it quite hard to keep the D-Eb trill perfectly regular (but still prefer it to a C#-D trill, and let's not get started on the Ab-Bb one...) I practise them by playing the two notes slowly in crotchets, then quavers, then triplets, then semi-quavers, then quintuplets etc. When you've got as fast as possible slow down by doing the same process in reverse. I do this with a metronome set at 60 and do 4 beats for each rhythm.
Thanks for this suggestion. I will try the trills more slowly, I think that's probably a good idea regardless. (Ab-Bb doesn't sound like something I want to look at yet.)