What Causes Swelling In The Toe?

my middle toe is a little swolen in the side of the toe towards the big toe but I don't know what happen. It doesn't hurt when I bend the to, just if I press on the side of it. There is no discoloration of the toe. There is one small point under the toe I guess where the tendon is at that hurts when pressed too. It has been hurting since Thursday. The thing is is that It really don't hurt that much almost like an ichy hurt. what is it, and what could have been the caused. Maybe a strained ligament I don't know.