drooping of the left eyelid and knot on the leftside of forehead.

Hi, My hudband is a 45 years old, healthy had been diagnose with mild opthslmic form of myasthenia. Scan, MRI was perform...all good. Doctors had no answer for the knot on fore head about iche,feels like a bone or fatty tissues.The doctor diagnose it as nothing  however, i am unsettle. I am convince they are both related.  what exactly causes the myasthenia? We need help. Can someboy please give us some information or a good Doctors in the New York neighbourhood we can look into...thank!