Scar tissue on the ear drum is usually caused by repeated ear infections. The scar tissue can lead to difficulty hearing and eventually ruptured ear drums. Surgery is one means of avoiding progressive hearing loss or ear drum rupture. No patients have reported taking Scar tissue removal (eardrum).
USCIS normally responds to RFE's within 60 days, however they do not have processing times on how long it takes them to respond. It can be longer than that. I would call the USCIS number: 1 (800) 375-5283 and submit a service request, if you do not hear from them soon.
How long does it take to get a respond after RFE? On November 4, 2014 we received your received your response to our Request for Evidence for your Form I-765, Application for Employment Authorization, Receipt Number MSCxxxxxxxxx. Our National Benefits Center office will begin working on your case again.