Look online to see if you can find silicone toe separators; I have the same problem on and off, and this has worked for me, as have also injinji toe socks.
For some products that help this, look for example at:
Note that when I was diagnosed with bunionettes (little toe side bunions), I was told that overlapping little toes are often associated with this, so if you do end up seeing a professional, be sure to explicitly ask about (and perhaps read up a bit first on) bunionettes. In particular, if you think there's any chance you have or might develop this particular problem, you should be looking for shoes with a wide toe box (and in particular wide at the outside part of the foot).
This is a little tricky; I've bought shoes that look fairly wide at the proper place but I still end up feeling sore in the bunionette area after doing some mileage in them. The shoes that work for my particular feet, at least, are Golite brand shoes. Note that I'm not saying this is the only good option, but just the one that works for me (whereas a couple of other brands known for wide toe boxes do not).