I have a lump on my rigger lower stomach, I had a bruise but it’s now gone I feel no pain around the lump. I want to know if it’s considered serious?

Stop worrying. Many times a bruise to any part on our body cause injury to the subcutaneous fat,which we call fat necrosis. This feels like a lump ,and can take a long time to disappear. It is thus ok to stop worrying,but if the lump suddenly starts to increase in size,or change in any other way,rather have it evaluated.