Interesting article concerning Dapsone producing a toxic neuropathy. Dapsone has a moderate to severe risk for someone who has CMT.

http://www.ncbi.nlm.nih.gov/pubmed/945490


http://www.hnpp.org/


HNPP (Hereditary Neuropathy with Liability to Pressure Palsies) is the opposite of CMT1A. There is a deletion vs a duplication. You get numb, etc. from something pressing on your arm or leg, etc. It's an interesting article which explains it well.

Just thought I'd throw this out there.