Diagrams courtesy of Netter's Anatomy

Pain in the big toe when due to peripheral neuropathy, may only be located on the inside part of the big toe, (letter A) and going up the inside portion of your leg towards your knee. (letter A)

Looking at the Dermatome chart below, this would be consistent with Dermatome L-4, which also corresponds to the pin labeled A.

Dermatome chart courtesy of Grant’s Atlas of Anatomy.

Order Grant Atlas of Anatomy at Barnes & Noble