i had this mark for a week now is it dangerous or something
it is probably good to see a doctor, unfortunatly doctors often have little insight in to many skin conditions. it may be that it is normal, or it could be something else that needs to be kept an eye and possibly treated.
i reccomend to you whatever it may or may not be to not use any soaps down there, only ph neutral product for people with excema etc and water
and nourish the skin with natural oil such as borage oil or organic sunflour oil, some like organic coconut oil etc
wear pure cotton underwear
reduce stress
best of luck and keep us all updated