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What is this on my toddler??

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I have a very active 3 year old boy who is always playing always doing something. well just a few minutes ago his father and I discoverd this small pea size lump right next to his nipple close to his armpit and on the outside is a bruise, my first thought is it has to be a knot at the fact that I am the type to freak out about anything and everything(lord help me) well this past sunday he visited his also 3 year old cuzions house the because is a lot more active and very playful and likes to play fight(im sure likke most boys) so now im worried parents out there please help me...p.s. it also feels like it moves when you push on it and he in no pain at all(kinda mad that we keep asking him to look at it..lol..)