Suggest Remedy For Itchy Skin Rashes Post Miscarriage

I miscarried in april and they have just found foetal tissue still left. It is now only one centimetre big so I have been discharged for it to come out naturally, but I am concerned because I have over the past 10 days erupted in large skin bump type rashes. It is very itchy. Is this normal and do I need to have any special treatment and if so is it urgent?