Firstly you should not be applying any hydrocortisone cream
unless instructed by your doctor. These creams are to be used very sparingly and do thin the skin.
Do not use any soaps, bubblebaths, or showergels as this dries the skin.
Wash the area gently, you can use baby solutions (I find they are alright). Baby Oil in the bath water is OK too. Just watch yu don't slip in the bath.