Hello. Thanks for writing to us at healthcaremagic Most likely it is an allergic reaction to a drug. Having said that, it should be confirmed by a visual inspection by visiting a skin specialist. Underlying psoriasis needs to be taken into account since psoriasis is known to worsen/flare during pregnancy and immediate postpartum period. This flare during pregnancy and immediate postpartum period is known as Impetigo Herpetiformis and is usually associated with fluid filled and pustular lesions. There is considerable itching and burning sensation in Impetigo herpetformis. Therefore, you must visit a dermatologist for a confirmatory diagnosis and for excluding the possibility of Impetigo Herpetiformis. I would suggest an OTC oral antihistamine e.g cetrizine 10 mg once daily. Topical you may use a soothing lotion e.g calamine, twice daily. Regards