It's not Carpal Tunnel related as it is on the wrong side.
It will be an Ulnar related problem if there is one.
Normally for the for an entrapment of the Ulnar Nerve there would be a residual feeling in the ring finger as well.
Looks like a localised problem to the edge of the hand maybe, and that is the problem here a picture tells nothing but opens up the doors to what if's and may-bees.
Go see a medical professional and tell them the whole story of what you do and how you use your hands, let the examine you and come to a proper diagnosis. Sorry but it's the only sure way to find out for certain what is doing on....like I said I cannot be Carpal Tunnel related as it in in the Ulnar nerve not the Median nerve, and Carpal tunnel is Median nerve related as it is the only nerve that uses the Carpal tunnel so can be the only nerve to be related to it.
Someone may say it's Cubital tunnel syndrome, this just means the Ulnar nerve is trapped or pinched at the elbow, but then you would have that residual feeling in the ring finger....as you would for any sort of Ulnar nerve entrapment.
So why does that area of the wrist hurt and just the little finger?... Well the evidence you offer does not fit nerve entrapment, so maybe it is a problem local to the edge of the hand, maybe a muscular one, maybe you slept on it,....but this is all guess work as you need an examination and you need to explain how you use your hands.....and that cannot happen on-line. It may even be a simple Neuropathy brought on by a cold, or it may be a complicated one form say.....Diabetes?
Again I could give you if's and but's to highlight any symptom, but see a medical professional and find out for definite if there is any problem.