If you indeed have perioral dermatitis, then I don't agree with your using a steroid cream. Steroid creams make this condition temporarily better, but then it flares up as soon as you stop, which seems to be what you say is happening. The best treatment for perioral dermatitis is oral antibiotics, but use of these is severely limited in nursing or pregnant women. I would advise you to not use steroid creams, to just use the antibiotic cream, and to get another opinion either from your current dermatologist or from a different one. Hormones and pregnancy typically do not affect perioral dermatitis, and successful treatment doesn't require hormone modification. In the end, however, you should be totally clear, with no scarring.
Take care.
Dr. Rockoff