Maybe you practiced too hard. When I saw it before, it seemed that because I practiced too hard, my muscles grew faster than my skin, so there were some strip marks. . . I can't remember. But in any case, the pursuit of bodybuilding is understandable, but the training should be moderate, and it is recommended to make a reasonable training plan. good luck

I read it in an old health and beauty magazine. I remember it as if this mark could not be erased, but it was too early to remember it clearly. Why don't you stop and have a look, or when you practice that place again, don't practice too hard or too much. After all, it is too late. I have a classmate who is the same.