Dermatology Questions? Ask an Online Dermatologist.
Can you attach the photos here? How tall are you? How much do you weigh? Pain or itch? When did you find it? Is it getting worse? Any other symptoms? Are you aware of anything which might have triggered it? Any medical problems? Any surgeries? Any other medications including over-the-counter pills and herbs? Any family medical history?
Can you attach the photos here? Without looking at it, it is difficult to say what it is.
It could be allergic dermatitis or inflammation because hydrocortisone is working. Continue to use hydrocortisone cream and observe it. If it is getting worse, you should contact your doctor.