On my left knee I have a lump on the left side of my knee it doesn't hurt when I walk or run, but when I go down to squat or kneel down it feels uncomfortable and hurts. I don't what it is?

Dad left when I was 12 and he always took his anger out on my brother who is the middle child. My brother is now 17 and I'm 19, I still am angry at dad so I hardly talk to him now but my brother moved in with him and has been living with him for two weeks now. Early hours this morning my...

I have a lump on my left knee it does not hurt when I walk or run ,but when I go down to squat it feels uncomfortable and it kind of hurts. I don't know what it is?

I have just noticed a lump under my left kneecap, its very hard and its feels like some bone is sticking out, its about the size of a marble, not painfull but sore! If anyone has ever had one of these I would be grateful to know what it is.