What is this mark on daughter’s body near armpit.. Pls help I am worried..it’s a dark brown color mark..

A. Mam is actually very difficult to say what it is so it’s better to get it checked with your doctor but does not seem like a major issues so before you get paranoid let me tell you sometimes these things could be due to a mosquito bite left sometimes it could be a birthmark and sometimes if hurt or something it can leave a mark like this but clarity can be provided with a physical assessment