IS MY ECZEMA CAUSED BY STRESS? PLEASE HELP?

i started getting eczema a few months ago. i noticed it started getting worse wen my gf and i broke up. i was very downhearted and stressed during this period. i then started getting more stressed about the fact tht i had eczema. i used steroid creams to calm the inflamation but noticed it kept coming back (its on the back of my knees, forearms, armpits and nipples). i am now going through a period of tough exams which also are stressing me out! i also play a lot of sport therefoe this leads to sweating quite a lot. my diet has been the same my whole life so its not diet tht causes it (im 18). do you think it is stress causing my eczema? or simply just sweating from sport?? answers are much appreciated guys,