Thanks for the query.
You might be suffering from a fungal infection
Probably candida infection.
Dont apply hydrocortisone
, it may worsen the situation.
You can apply an antifungal cream like clotrimazole
Also take an anti histamine tablet for the itch.
Dont worry you may get relief with this.
Please meet a dermatologist
and discuss regarding this.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.