Ive been born with a congenital bent index finger that looks like a mallet finger and my nail is small. what is this called and can i fix it?

Virgin finger: A congenital mallet finger is known as a virgin finger. It is due to a a problem of the extensor tendon of the finger. For best results consult a hand surgeon

Symphalangism: is the name often given to joint and bone issues in digits, there can be a joint of less motion or fibrous or bony union and or a portion of the finger is smaller. treatment is directed towards functional gains if possible, however there are times when nothing needs to be or can be done: see a hand surgeon with experience with congenital hand issues