I HAVE A SMALL LUMP ON MY BACK THAT HAS

I HAVE A SMALL LUMP ON MY BACK THAT HAS BEEN THERE FOR ABOUT 2 YEARS NOW TINGLING AND I HAVE SHOULDER PAIN AND ACHE THAT GOES DOWN MY RIGHT ARM AND PAIN IN PAD OF MY THUMB. I AM ON THE COMPUTER ALL DAY AND 3-4 HOURS EVERY NIGHT, I THINK MY SHOULDER AND ARE PAIN ARE USED TO OVER USE, NOT SURE WHAT THE LUMP ON MY BACK IN WITH TINGLING