Friction produced by your finger rubbing against the strings will make your fingers really sore. You may want to try something like fast fret or finger ease. Finger ease only lubricates the neck and strings but fret fast cleans your strings as well. Also if it has been a while since you have played your guitar put new strings on it. When grime and junk build up on your strings (making them sound dead) this will also add to the friction while playing. New strings will help reduce the friction and you fingers will not hurt as much. You may want to consider dropping down a size in strings until you get adjusted to playing again. Then go back to your normal gauge after you become acclimated. That is what I always do when I stop playing for very long. I use Elixer strings which are polymer coated. That also cuts down on friction. If you use them I am warning you they will spoil you. They stay brighter longer and are easier to play. After playing them for a while other strings (well to me) sound like they go dead instantly. The coating helps alot as well my fingers get sore faster with non coated strings quicker than with coated. I have been playing coated for so long that I can really tell a difference. Just for the record I am not endorsed by anyone mentioned lol just my personal opinion.
cya
JT