defects on sides of print

does anyone know what causes this , I am printing in ABS on my M200 and I am getting small bumps with a line leading to them ( please zoom into the pic to see)  

I have changed the bed , nozzle and roll of ABS , layer height , I also ordered a different batch but the problem is still present  It is sometimes worse than others .  I have opened a new sealed roll of ABS and printed immediately but the problem is there.



I think the last version of Z-Suite has some filament retract  problem

Do you have "SEAM" set to "RANDOM" ? Its in the advance option when you go to print.