Sounds like she has been fighting , however if cats fight the most common injury and illness as a result of this are cat bite abcess. These are because the bacteria on the cats teeth. If these are unotived then they swell and eventually burst causing open wounds - this will require cleaning twice a day (salt water warmed) and a course of antibiotics
The other possibility is that it could be a parasitic infection - again this will need diagnosing and the proper course of treatment offeres.
I would definaltley advise a trip to the veterinary surgeon to clean these and a course of antibiotics. If the wounds become infected then other illness begin - high temperture , not willing to eat, vomiting, etc...
It is best you have your cat checked in the mean time i would keep her in doors.