Oh - because I am a guy. I knew girls would use makeup to cover up but I never considered it for 20+ years of dealing with occasional adult acne. (one big one at a time...sometimes two). A few months ago I got some Clearasil Adult Acne Tinted Cream just to see if it would be a good alternative to BP. It really wasn't (and smells bad) but did cover up the spots - so I started using it during the day only on the spots.
The tone doesn't match my skin perfectly, and I am sure if someone got really close they could tell what was going on - but for 98% of people I socially interact with I don't think they can tell - and it sure beats having a red thing on my cheek that no one can miss. (You have to experiment with getting it to look good - it is a lot like painting).
So my advise to guys out there is that a little spot cover up (there are different types) can go a long way for your self esteem. I wish I had tried it a long time ago.