Watch band rash

Hi there! I purchased a new band for my watch a couple of months ago. I didn’t realize anything at first other than my wrist was a little itchy. Over the past month I’ve developed a bad rash on my wrist that won’t go away. I originally thought it was a heat rash or from my perfume. However, I started wearing my band on my other wrist, on a looser setting, and now developing a rash on that wrist as well. I was wondering if this is now a reaction to the band. I had my other rubber band for 3 years and never had an issue. I’ve worn my watch almost every day since Purchase and I love it! I really don’t want to have to stop wearing it.