Small Lump Between Legs Uk There Was A Small Lump On My Leg...like A Bubble Of Skin.?

There was a small lump on my leg...like a bubble of skin.? - small lump between legs uk

There was a small bump on the leg between the knee and foot. It is really small, and came after 20 minutes excersize, excersize me again for another 40 minutes, and the tumor has disappeared ...
is a serious matter? because I was not injured, I realized that if I was able to stretch on foot after 20 minutes. , and now it is not there, I continued to play, and now its gone ...