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.
Most I-140 categories are eligible for premium processing. If your category is eligible for premium processing, the I-140 petition will be processed in 15 days. An additional fee is required for this service. It is not uncommon for I-140 petitions to be delayed by a request for evidence (RFE). If an RFE is issued on your case, you will be given a deadline by which to respond.