Little finger tendon problem?

My little finger on only one (right) hand is starting to act up, i first noticed this 4 years ago but it hasn't really affected me until now. I've just joined the Army and i need to be able to salute properly, and do press-ups but when i'm saluting my finger goes into a slight ^ shape making saluting uncomfortable and it looks like i'm doing it wrong. This also happens when i'm doing press-ups which makes it very uncomfortable to do them too. Does anyone know what this is, why it is happening or what i can do to stop it? Thanks.