resizing text to a small point size cause spikes on "M" and "N" characters

I have some text that I resized to a very small point size (3pt). However, upon doing so, I noticed spikes appearing on the "M" and "N" characters. What is casuing this and how to fix it? I need the very small point sizes, so resizing it to a larger point is not an option.

I have attached a scren shot showing the problem.