Repetitive stress: I don't know how long you were holding the can and and how hard you were pushing down on it to get out the contents but it sounds like you are a victim of what is called "repetitive stress injury". It will pass with time. In the future you might buy a small flexible rubber cap to put over the hard plastic nozzle button they ask you to push on. Also use a shoulder pad.
Answered 9/12/2017
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