I slamed my finger in a car door a week ago. must of damaged a nerve. when will feeling come back? it gets very cold when outside

Neurapraxia: A crush injury to a sensory nerve in the finger can cause a neurapraxia, which is a temporary loss of nerve signal conduction. This usually resolves within 6-8 weeks.

Should recover: Closed crush injuries usually cause temporary neurapraxia injury which improves within 4-6 weeks. Rarely more severe pressure from the crush can physically disrupt the interior of the nerve which may take up to 12 weeks to improve but with uncertainty. In the absence of a laceration observation is recommended.