8 months ago I was walking on the beach with my friend when I fell backwards onto a rock and hurt the back of my thigh very badly. A few days later it turned out to be a humongous bruise that was bigger than my hand and was down my entire thigh. The bruise is now gone but where it was there is now a large lump in my thigh. If I press down on it hard enough it hurts really badly. What is wrong?!