Developed rash after breast augmentation. Has anyone else experienced this?

I had breast augmentation surgery 2 days ago. Today I developed a bad rash around my neck, upper chest and stomach. Has anyone else experienced this and if so what was it from and how did you treat it? I’m calling my doctor tomorrow, but also wanted to see what other people went through. I’m currently taking sublingual Arnica Montana tablets to help with bruising and swelling. Also taking a muscle relaxer and hydrocodone as needed for pain (I’ve taken before without issue).