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.
The first step is to contact the board of nursing where you wish to be licensed. Each nursing board sets the guidelines for how frequently nursing candidates can take the NCLEX. Typically, you must wait 45-90 days before a NCLEX retake. While you have them on the phone (or email), ask if you must resubmit your licensure application when you re-register.