I am a 15 teen year old. i have a reddish white bump, looks like a swelled up ball, on the left side of my penis shaft. is it normal? what shold i do?

Sexually active?: It depends upon whether or not you have been sexually active. If you have been having sex then you need to see a doctor and get an exam to make sure you do not have an infection. If you have not been sexually active then it may just be a small cyst. If it is a cyst then will probably go away on its own in a few weeks. If it does not go away then see a doctor for evaluation.