Most often, this is a condition known as "hammer toe". It is usually not painful and is surprisingly common. The reason it bends inward is the shortening of the ligament that bends the toe.
There are surgical treatments for the condition, so check with your physician if it bothers you. Another fairly common way to treat it is to wear an adhesive bandage across the bend. It will, over time, allow the ligament to stretch.
If the condition does not bother you, this is a safe treatment. Be sure to change the bandage daily for cleanliness.
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