Jawaharlal Nehru Institute of Postgraduate Medical Education and Research(JIPMER) is a national level entrance exam that is conducted for admission to 200 MBBS seats available in JIPMER Puducherry (150 seats) and JIPMER Karaikal (50 seats).
As for your question, if there are no major changes between your facial features in the 2018 photo and now, then no reason to worry about it. Generally newer photos are recommended so that there is no problem while identification of the candidates at the time of exam as well as admission.
For more information about JIPMER, follow the below link:
Https://medicine.careers360.com/exams/jipmer-mbbs
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