Finger numbness with no injury

Patient: My thumb has been completely numb for days now and it’s starting to concern me. I can’t feel the upper half (not palm) of my thumb at all and same with the outer part of my pinky. I have no bruises or pain anywhere to suggest aggravation of the nerve. I tried to wait a while to see if it would pass but it hasn’t. I am also in my early 20’s so don’t expect anything degenerative. Should I be concerned? Or are there any suggestions?

Symptoms: Complete numbness of thumb and outer pinky.

Doctor: