What could be a numb like sensation on the plantar surface of my foot between my big toe & second?

Neuroma: There are nerves that run between your metatarsal bones. You can develop growth on the nerve called neuroma. X-rays and us is needed to correctly diagnose. Other causes can be tarsal tunnel syndrome, sesamoid fracture and bunion deformity. You should see a podiatrists to correct diagnosis and treatment options.

Anterior tarsal: Tunnel syndrome or a neuroma. A radiculopathy from the back would be another possibility.