I've been sorting through some of my cosmetic boxes (as one does) and came across some Clinique City Block Sheer SPF25 that I purchased a few months back. I only tried it once or twice then and stopped because of irritation. The bulk of that irritation was caused by Retin-A as it turns out, and possibly SkinCeuticals Serum 20.

So, today I decided to pop the City Block on instead of my moisturiser (which has run out anyway). While it looks nice, I am having a slight reaction to it. What it feels like is little insects crawling on my face - it's a slight (and it is only slight, but still noticeable) tingle.

The question is, should I stop using it because of that or carry on for a bit and see what happens? What would you do?

Thanks