Odd print problem

In my attempts to print at 0.1 mm/layer (i know, i know, it's not recomended with a 0.4mm nozzle) I've run into a slight problem. One side (right side) of the print is coming out with a weird looking gash in it!

Not sure what's causing the gash, if it's too much or too little plastic, but it sure is annoying... It seems to start small, then get wider and wider as the print progresses.

the part I'm currently printing is a 1cm^3 (1 centimeter cube)

Here's a picture of the problem:

I colored the flat area on the side with a sharpie, so that you can see the gash, there's also what looks like a bunch of bits of plastic fused to the part on the other side of the gash (where there's a bunch of dots).