Going to make a GP appointment asap but wondering if anyone else can suggest to me what this lump might be? It's at /near the knee joint but on the outer side of his leg and is hard and about the size of a small egg. DS says it doesn't hurt and may have been there a while. I've not seen it before.
Am wondering about possible causes from something v minor - like sports' injury related - to something catastrophic. I know we'll need medical advice on this but if anyone can suggest what it might be, please do, as I'm panicking.