Hi guys, can't seem to get my 3D printer to print in PLA correctly. No problem with ABS at all.

I'm using an aluminum platform, heated to 50c with my extruder at 190c. Whenever I print, it seems as though the layers start bunching up on my extruder. The extruder seems to hit the previous layer, but if I raise the nozzle up, the print quality is horrible. Any ideas?