IUD side effects?

So i got lilletta IUD put in about six weeks ago. I'd say about a week and a half later i got a rash all over my chest. I thought at first i was breaking out but it's only my chest. They are red bumps some white heads. It itches sometimes, not its gone away like 5 times but keeps on coming back after a few days. I started used this cream i had for eczema on it a week ago and it went away, sure as shit when i stopped using the cream it came back. Wtf is it? No difference in soaps, detergent, lotions, anything like that.