How to Treat the Rash Around my Stitches?

I would share this photograph with your own plastic surgeon. In general allergies to adhesives are treated with steroids and avoidance of those adhesives.

I don't think this is a rash. It appears much more serious and might be a hematoma or infection. You need to see your PS asap.

should always be directed to your surgeon as your surgeon would better appreciate what could be causing your concerns.  Wound issues can arise from many causes and there is nothing better then a physical exam and detailed history of what is being done to care for the healing wound.