How to know when you're getting a pimple?

I don%26#039;t know how people know when they%26#039;re getting a pimple. Do they just feel it or what? Answer if you know.|||it gets real sore on the area that is going to have the bump and it starts form the pimple|||Theres really no telling, it just occurs on your face when you least expect it. I haven%26#039;t really got the chance to watch my face develop, or possibly get a break out... but the best thing to do is keep proper face lotion on it and avoid candies.. etc.|||it gets really sore in the area and u will c this white or pink bumb forming