numbness can be nothing or it can be something.
best thing to do when you have an actual physical problem, is see a doctor. While the fine folks here at ATS will gladly give you diagnosises ranging
from "dude, you're cold, get gloves" to "well, the plasmatic ventricular rays from the Nordic ships has damaged the nerve endings in your finger.
This is a side effect from your being abducted! Lucky you!" you should, in all seriousness, see a doctor.

