Since this is a forum about PN, I hesitate to answer the question about actual sweating, except to say that (again, without researching it) I would think that since PN affects the peripheral nerves, usually of the extremities, sweating around your chest is probably not from PN. Sweating is very variable among different individuals, and may not be an indication of a disorder for you.
Ask your PCP or see a dermatologist about things you can do for what you consider to be excessive sweating.