If your finger scans have not been captured, personal appearance is mandatory when applying for a Schengen visa. Fingerprint scan is not necessary for children under the age of 12.
If your finger scans were collected within the last 59 months, then you won’t have to give new fingerprints for your next visa application(s) and personal appearance is not necessary. However, you still have to book an appointment for the application to be lodged by yourself or your representative and you have to provide a copy of your visa sticker. If you are not sure or do not remember whether your fingerprints have been captured for a Schengen visa within the last 59 months, you have to appear in person.
You will still have to appear in person to give your fingerprints in case the previously collected fingerprints prove to be of insufficient quality.
The Swiss representation still reserves the right to ask the applicant to appear for a personal interview after checking his application.