You are my new best friend!
Just started my guitar lessons this past Friday and, like with all new guitar players, my fingers were getting really sore. Did some reading and found that a common suggestion is to soak your fingers (the tips of course) on your left hand in apple cider vinegar for about 30 seconds to a minute before and after practicing. The vinegar acts as a numbing agent for your finger tips and allows you to practice without as much pain, and then soaking them afterwards helps with the little pain you may still feel.
Luckily we had some in the cabinet because I use it to clean the dogs ears with (50/50 with purified water). I had almost forgotten about it but then remembered I had gotten a smaller bottle a few months ago.