I have been having chronic back pain, can't sleep at night, now have total numbness in my right thumb area. And I keep getting these spots showing up like blood blisters then they go away. Is this a sign of lymphoma?

Doesn't really sound much like it, although it's impossible to say from here. That said, the chronic back pain is an extremely rare, very very rare symptom of CNS lymphoma, sometimes, but in order for this to happen, you would need a tumor mass causing the pain.
The numbness is odd, no idea about that. As for the spots that come and go, well I suppose that's possible in cutaneous lymphomas, but generally those lesions aren't described as blood blisters.

All told, none of these symptoms line up with the traditionally understood symptoms of lymphoma: painless swollen lymph nodes, fevers/chills, unexplained weight loss, night sweats, fatigue, maybe an unexplained cough. Keep in mind that lymphomas compromise one's immune system, which leads to the symptoms. beyond the blisters, your symptoms don't really point towards the immune system. Depending on the type of back pain, your symptoms sound neurological. caused by what exactly, I don't know, but it sounds like you should make an appointment to see your doctor about this.