A Couple Of My Fingers Pull Down And Cramp Up.

A couple of my fingers pull down and cramp up. The move down by themselves and I have to use my other hand to pull my fingers back up. It is painful. Also, when I point my toes on my right foot, my foot cramps up and my toes feel like they lock up and the pointer toe separates and pulls away from the other toes. This has been happening since I was about 8 years old and seems to be getting worse. I went to a joint specialist for an unrelated issue and when I mentioned to him this problem with my fingers and toes, he said he has never heard of it. Any idea what this could be caused by?