Sensitivity to skincare products and makeup after CO2 laser

I had CO2 laser 2 months ago. I'm noticing that certain products cause itchy rashes, which then goes away after I apply 1% hydrocortisone. I understand that my skin is sensitive, even to products that I used to use in the past. And every time I try a new product, I'm fearful that it will cause a rash. How long will this hypersensitivity go on?