P.S. Here is a list of things that have SF damage:

Metabolic
Diabetes mellitus
Hypertriglyceridemia
Hereditary
Amyloidosis
Hereditary Sensory Neuropathy I (HSAN I)
Congenital sensory neuropathy with anhidrosis (HSN IV)
Congential insensitivity to pain sensation without anhidrosis
Hereditary ataxia with thermoanalgesia & loss of fungiform papillae
An-α-lipoproteinemia (Tangier's)
α-galactosidase (Fabry's)
Hereditary sensory neuropathy + Spastic paraparesis (Cavanagh's variant)
Hereditary sensory neuropathy with loss of pain perception
Congenital indifference to pain

Navajo neuropathy with arthropathy
Cold-Induced Sweating Syndrome
Toxic: Kepone; Ciguatera
Infection: Leprosy
M-protein
Idiopathic: Often painful