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If the pain is about right at the deltoid muscle (where you get a shot in the arm), it may be your rotator cuff. Stand with your arm hanging down by you side (fingers pointed down to feet). Now, bend the arm at the elbow without lifting it at the shoulder. Now raise your elbow (straight out away from your body) so that it is level with your shoulder.
Do you feel pain in that part of your arm where you would get a shot? If so, it could be your rotator cuff that is impinged. Have you pulled anything heavy in the past few days/weeks? Rotator cuff impingments do not show up sometimes till weeks after the initial injury. Often rotator cuffs hurt at night when you are in bed or just when you are sitting doing nothing - a sort of dull ache.
This may not be it at all, but it is an easy way to check for it.
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 Gayle
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