Why do I get a popping sensation under my skin after running?

Since I was in my teens, I have noticed a feeling of what can be described as blood vessels popping under my skin (legs, hips and butt) after I go jogging or running for more than 5 minutes. What is this and is it bad? It%26#039;s not painful, just weird.|||I think I know what you are talking about, I get a similar sensation, though I wouldn%26#039;t necessarily describe it as popping...I think it%26#039;s the muscles reacting (ie contracting and stretching bc of the lactic acid) to the exercise and don%26#039;t think it%26#039;s an issue. Try gently stretching to relieve it.