Can you tell me if mederma will help with sensitivity near scars?

Not likely: Note that mederma and the majority of topical treatment for scars have been shown to have no improvement on normal wound healing, and would be very unlikely to change the sensation (but it won't hurt.) vitamin e and massage have some very week evidence of benefit. Protection from the sun is the thing that has shown the most benefit- use and reapply good sunblock during the first year of healing.