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1. Birthmarks rarely cause problems, other than cosmetic changes, psychological distress, pain, bleeding, or rapid increase in size which needs to be treated.
2. since you are applying
topical steroid [hydrocortisone], other options include: concealing cosmetics,
cryotherapy,laser surgery
PS. The risks of laser surgery include transient
hyperpigmentation,
hypopigmentation, slight scarring, permanent hyperpigmentation, and recurrence. I would advice that you
consult a Dermatologist with Good laser experience in these kinds of lesions.
3. a health care professional can diagnose a birthmark based on the appearance of the skin, so have an appointment with your doctor. [since problem is ongoing]
PS. They can be covered up, but not improved by creams and lotions