You have probably been playing too much or pressing too hard. Try not to do them 2 things and you will build up harder skin in that part and it will not be a problem.
Phil.
I never had callouses on my finger tips until I started playing tenor ukulele. Never got them on nylon string guitar and didn’t really play steel string where I’m sure I would have developed callouses. I do smooth them down a bit with my Emory board. The only problem I had was sliding across a couple fret ends next to the A string and have since had those rounded down.