Tell you mom or dad and ask them to take you to the doctor. The numbness bugs me--unless it's because of a certain way you are sitting. The bumps *could* be your lymph nodes, which could be a sign of an infection. Then again, some people's lymph nodes simply present themselves at random times. The fingertips... If it's more of a purplish blue, it could be a sign of poor circulation. Not sure on the hip bones clicking or why you're sweating so much (nervousness? exercise? is it hot outside where you are?).
Definitely go see a doctor, if you can. They're the only ones who can actually diagnose any of this. All anyone on the internet can do is give you random possibilities based on what they know.
I don't know about the bump, but you should definitely see a doc about your leg going numb. You could have a pinched nerve in your back. As for your hand being purple and cold- that could be a condition called Raynaud ( not sure on spelling) good luck!