Anyway I'm using a wacom now, but when I'm doing pixel art in Photoshop, if I touch the pen down somewhere, it'll mark it as me having done something in the history, but nothing will actually show up. But a pixel WILL show up if I put the pen down next to the pixel I actually want and drag it over there.
For example, pretend that the number pad is a square of 9 pixels:
789
456
123
If I want 5 to be black, I can't just click 5. I have to click on, say, 6, and then drag over to 5. And when I do that, 6 doesn't change color.
Chojin 
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