Hi, it appears to be an infection, rather than allergy. or if due to allergy, it may be due to food you have started recently, or soap, spray, clothes, etc. I advise you to consult a dermatologist for diagnosis and treatment.
I to my patient with such infection, prescrbes, levocitrizine, montelecast, and cifixime . Thank you.

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1. It looks like an Allergic reaction to something (from food to detergents used in laundry), so apart from hydrocortisone you should consult with a Dermatologist regarding Pityriasis rosacea or tinea versicolor or rhus dermatitis.
2. non drowsy and safer anti histamine in pregnancy is ranitidine/famotidine, you can talk with your Attending Physician regarding the same.
3. Oat meal bath with calamine lotion, OR take vinegar and Gulab ark (in equal amount) or Whisky 1 part and water 2 part and massage on the skin.
4.mix Karpoor in Neem oil and apply over affected skin.
5. Nagkesar 6gm:powder it and mix 24 gm honey:take morning and evening (LICKING), tested and useful Ayurveda remedy.

hi i had gone through your query and understand your concerns. i would come up with the possibility of ALLERGIC DERMATITIS is most fit your condition.

external application of steroid creams may suppress the disease never cure by it.and repeated again.so it is not safe for you and your baby.

treatment plan;

i advise you taking Homeopathic medicines gives safe and permanent cure for your complaints without any side effects.

for the selection of constitutional similmum on the basis of causation,location,sensation,modality and concomitant,you should consult your local homeopathic physician for correct diagnosis of the case and remedy to fit your complaints. or mail me at drravib4u@yahoo.co.in
I hope this is helpful for you, wishing you good health.

thank you