I do have this experience and yes I know I have a pimple and you don't really have to point it out again.
Few years ago, my friend bought this "rescue me acne blemish treatment cream" to me. It is AMAZING!
Whenever I have a pimple, when it is just start, I cover this cream on it after cleaning my face and appling my lotion. The pimple gradually turns pink and then disappears.
I admit I can't find it in hk now. But I buy three of these in Australia. If anyone goes to Australia, please buy one and try it and you will understand how powerful it can be! :)