If you are being treated by a neurologist for a significant medical issue, it is best to let your neurologist know that you are contemplating undergoing elective cosmetic surgery. Its best that your neurologist gives a letter of clearance to your plastic surgeon, so that there is no medical issues with your surgery or recovery.
Medical clearance is required before you have surgery. All relevant medical conditions must be revealed, including medications , tobacco use, recreational drugs, herbal supplements, allergies, etc. Any specialists treating you also need to give clearance .It's for your safety.