Hello,

The points to remember regarding thumb impression is given below

• On white paper, make a thumb impression.
• For the NEET 2021 thumb impression, only blue ink should be utilised.
• Before uploading, scan the image of the NEET thumb imprint.
• NEET-UG The thumb impression must be distinct.
• Candidates can upload their right thumb imprint if their left thumb is unavailable.
• The impression should not be hazy or ambiguous.
• The application form for NEET 2021 will not be approved if it does not include a thumb imprint.

Please go through the given link regarding the application process

https://medicine.careers360.com/articles/neet-photo-size-format-documents

Hope it helped

Good luck!!