I don´t pick at whiteheads. I steam my face, sterilize a very thin needle, pop the pimple and pull on the skin on both side of the pimple so that the white stuff comes out on it´s onw.
I do pick at the skin on my lips though, when it´s cracked. It´s bad cause it makes my lips look worse! And when I have a cold sore I can´t stop touching it to see if it has already gotten bigger...same with big cystic pimples