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.
But luckily there are a number of ways you can boost your chances in this often frustrating waiting period. First, ensure your application has definitely been received. If there's a set deadline, wait seven days before making contact to see if your application has found its way safely to the employer. If there is no closing date then wait two weeks. Drop a line to the person you applied to, confirming that you made the application and that you are keen on the role.