Teen dd with atypical bruising should I explain

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14 "yo Dd has started a new sport which has caused some quite dramatic bruising to the back of the legs especially the back of the thighs and knees, which is I think an inevitable part of the sport. I am not sure if I should mention. It to the school incase the pe department flag it

I think it’s a bit weird to pre empt that.
Surely if there is a query they would just ask her.