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.
1 You should plan to arrive at the test center at least 30 minutes before your testing time. If you are more than 30 minutes late, you may be required to forfeit your NCLEX appointment and will be required to reregister and pay another exam fee.  Occasionally, technical problems may require rescheduling of your exam.