I had rashes during pregnancy too. Very bad ones. Whole body except face. The scars r still visible :( you can try calamine lotion or physiogel got a lotion for super sensitive skin. Bathe in cool water not too hot. Don't use harsh soap. Those antibacterial soap like lifebuoy n etc are too strong. Use those soap free type.
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Oh dear, why not go and seek medical advice. Better option for them to recommend you something. Meanwhile, jiayo!
What cream or lotion are u applying? Change ur body wash to soapless ones.