My 1 year old nephew had something similar. He had fungus on his testicles and My sister bought this medicine in Mexico and they dissapeared rapidly.

For god sakes- tell your parents. It is more likely nothing other than an infection. But don't be stupid like me and let something go and it turned out to be cancer. Testical cancer is higher in younger males between 16-25. PLEASE don't let pride get in the way of seeking medical attention. Tell your parents about the problem and ask them to schedule a doctor's appointment with an urologist. Tell them I would perfer the doctor to look at them and not my parents.
I always had a difficult time of letting another male see that area of my body and really when he felt around. But after losing one testical and chemo, I now demand him to check me each time. Don't repeat my sorry performance!