Petechiae- very worried.

I am very worried due to me always linking petechiae with leukaemia 

Hello

In January, a small patch of petechiae appeared on my leg nothing more nothing less. I went to the doctors and did a blood test and they said I was fine and it was nothing to worry about. 

It went away however a month ago it appeared again but bigger, I also gave many dots on my feet and legs. 

I am very worried any advice?