--burning, stinging, tingling in my lips, chin, and even my scalp from time to time; fortunately it tends to go away after some days/weeks.

It's become more appreciated that those with small-fiber neuropathy may have such symptoms beyond the "stocking and glove" distribution. People with possible autoimmune (think gluten) and toxic possibilities, especially, are more likely report symptoms beyond those "usual" areas, as their situations do not involve a length-dependent "die back".