First of all, I apologize for my level of English.
I'm 25 years old. For a month, my thumb has involuntarily moved towards the palm of the hand. At rest it does not happen.
However, if I flex my thumb towards the hand, it contracts for a few seconds.
This contraction displaces the thumb a few millimeters.
Last week I realized that it also happens to me in the middle finger. As with the thumb, only when I flex the finger with force.
After searching the internet, I am so scared. Thank you very much and greetings.