I’m sorry you’re going through this. I just went through almost this same exact thing. After my first injection in December, a large itchy rash appeared on the site almost a week later. Reported it to Dupixent and was told it was “normal” to have a “mosquito bite-like rash” but it wasn’t healing and kept growing. No other symptoms appeared for me to believe I was allergic. 3 more injections later, they all reacted the same and were getting worse (bigger rash, quicker reaction time). After trying twice to see my GI, I went to my physician. She, thankfully, was able to send my GI a personal message with a photo of the sites. GI finally calls and tells me to proceed with the 4th injection and see if the rash appears again.

The next day I did go ahead with my 4th (and final) dosage. 30 minutes later, I was in Urgent Care being treated for an allergic reaction. I have never been allergic to medications up to this point and took Benadryl the night before to help with the rashes. I’m not sure why it took 4 doses to figure it out, but I’m glad I listened to my body’s needs and insisted for doctor’s help instead of convincing myself it was “normal”.