Swollen toe knuckles

I'm sure lots of climbers see their toe knuckles swelling up across the years of wearing tight climbing shoes. But I was always wondering how we can limit/reduce/get rid of that. Any ideas? My left foot is slightly bigger than my right one and therefore it gets tighter and now I feel like my little toe is more swollen than it used to be :( I'd like to reduce it, and keep climbing meanwhile, so that the shoe doesn't feel as tight on that side.