Are my rats fighting?

I have two female rats who have live together for at least six months. they were probably born around august-july an they wrestle and squeal all the time... I know it is most likly playing or dominence scuffles but I would like to know if I should be concerned. One is hairless and she get scratches and marks from time to time... The one with hair seems fine. I know that hairless ratess are more prone to this kind of thing because they arent protected by hair but should I be concerned... It even looks like she is the more dominant/trouble starter...
 
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