What Causes Brown Bruise On Leg?

Hi. Couple days ago I saw bruise on my daughter s leg and I didn t think much of it. My husband just saw it today and he said that it looks scary and I should really watch it closly. The bruise is light brown with slightly lighter center that sticks out a little bit, like some sort of lump. My husband pushed on the bruise a bit hard and asked my daughter if it hurts, she said that it didn t hurt. My daughter freaks out about every little scratch on her skin, so when my husband put a lot of pressure on her bruise and that didn t make her cry or scream I began to worry. We don t have any insurance at this moment, she is due for her 3 yaer check-up next month, so we will see a doctor soon but I was wondering if you think I should go immediately and not wait. Thank you and looking forward to your answer.