Agree with Trudie.. My doctor sometimes even added the dreaded word "tumor" into the mix.. All in one visit mind you, so don't worry. Check out the top right of this page "Health Pages" where you will find all sorts of info regarding cysts..Keep us posted
Doctors will often intermingle the terms lesion, cyst, mass, etc. A transvaginal ultrasound will give a better view. The 1.3 cm lesion is quite small and hopefully is just a normal ovulation cyst. Good luck.