Suggest Treatment For Water Blisters On Big Toes

Hello, I have been running 4-5 days/wk lately and about 3 weeks back I developed water blisters on the outside of my big toes. They haven't gotten any worse or better so I just left them to callus. I woke up this morning and the skin on the right blister is greenish colored. It doesn't hurt and I cleaned and popped it and only a little water came out, no puss. Is this a problem or just something that comes with the territory? Thanks!