I hit my head, I still have the numbness in my arms and hand

hello!

today, while playing soccer I couldn’t stop and hit my head to a tribune stand, I immediately ran to locker room and put some ice on the area where my head was hit then went back and continued playing soccer. Now, it’s been 8 hours since this happened and I still have the numbness in my arms and hand, which started after 20-30 mins after I hit my head. How concerned should I be?

I am a 18 yrs old male, with 185 cm height and 72 kg weight. I don’t use any pharmaceutical drugs. There’s a little pain, I’d rate it 3/10, but it’s mostly numbness in my arms and chest where I also hit while playing football.