I know this is an old post but I have the exact same thing. I've had this for over 20 years and was wondering if you ever found out the cause
Food sensitivity can cause things like this while you are trying to figure out what they are from try staying away from chocolate and citrus fruit, also tomatoes.
on 5th sentance i wrote then i noticed another and no on both hands a total of 16. The correct sentance is ::::::::::::::
: Then i noticed another and now i have them on both hands and have a total of 16.