I Have A Growth Inside Of My Leg Thigh. I

I have a growth inside of my leg thigh. I don't feel any pain but the growth is gradually getting bigger. At first I did feel some discomfort. The initial pai started when I returned to the Gym and think I pulled something but I am not certain. I know that I will eventually have to go get it checked, but I want to be sure that I have some time.
Any suggestions