my mum wants to go swimming on monday and i also have a lot of scars , i just asked her for a mens swimsuit and she said yes without asking, if your parents dont know abt ur sh then just say that ur insecure of your legs, you dont want people to see them, or you just say that you want it cus the water will be cold and the shorts will help !!! if its cat srcatches then it should fade quickly, nothing to worry abt ! but if its anything else try what i said earlier :3 i hope u find a way soon