Bump on leg when squatting. Know the causes, symptoms and natural remedies for bump on shin bone. It usually occurs in sporty children and adolescents. Individuals with this condition often experience discomfort and warmth in the affected areas. Never attempt to catch a falling safe. Depending on the cause, leg lumps may be single or multiple, soft or firm, painful or painless. The causes vary widely. I reduced my frequency quite a bit and it started to go away Mar 3, 2021 · Hello, and thank you for your question regarding lumps on your lower legs that become more prominent when you flex your leg muscles, and specifically, what are they, and can they be removed? Thank you for your history and your pictures. Don't drink/smoke/take drugs. But they do know some ways you can avoid or alleviate them. This is directly related to the underlying anatomical structures of the lower limb reacting to the significant pressure and muscle contraction involved in the exercise.