7w baby w/ spider veins on her cheeks, mostly her left one. is this due to using hydrocortisone 1 for ~10 days? will they fade? she has very fair skin

Likely: Most childre grow out of everything, but predictions of the future are always hazardous. These are not related to the medication

Possible: Hydrocortisone initially constricts the blood vessels but prolonged use would dilate them . If this is from the cortisone, then one would expect these vessels to return to normal within 2 weeks after stopping .