It started to hurt near my testicles, it hurts when I wear boxers and it itches

So one week ago I went on a run then between the thighs near the ballsack area it started to hurt because I ran with boxers so my thighs started to hit against each other so I thought if I ran with boxer briefs it would fix that problem so I did and it worked but then when I started to wear boxer briefs my balls began to itch so I scratched it for 2-3 days then I sat in the bathtub because my mom said try using this type of chemical it might help it was a thing called "hexol"(the jug name) then it became less itchy but then I noticed my balls became scaley and patchy hard and I lost the brown layer on my balls and it became red now, it hurts when I wear boxers or boxer briefs and it still itches. What is it and what do I do can someone help me? P.s I'm 18