bumps in keys

[Cameron Jacobi]

Hi,

I have a question for anyone who would care to answer
- I tuned a piano yesterday - a Sohmer upright, about
20 years old - a lot of the keys were sticking - but
two of them, when I pulled them out - had something
like wooden blisters at the sides - I don't really
know how to describe it - it was as though something
inside the key was trying to make its way to the
surface - almost like a bubble in the wood - if the
wood continues to do that, those keys will be rubbing
the ones next to them.  Does anyone have any idea what
could cause that, or what should be done about it? 
I'd appreciate any input.

Thanks,


Harriet Lipman

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