Well... Maya's skin has many problems, some of them are even baked on the diffuse (base color) maps and, unless you remake 'em, they'll persist, but you can do many things to improve it: remove all displacement maps; remove the bump maps (a bad bump is worst than no bump at all, and Maya's bump maps are just desaturated versions of the diffuse maps -- which are not entirely bad but there are some problematic areas that are transfered to the bumps --, remove the top coat bump maps; and, if you want to attenuate it even more, replace the glossy and TC weight maps with the "Micros.jpg" provided with DT Yolanda materials. Here's the comparison (I'm using the ass not onlly because I'm fond of this part of the body, but because it's one of the most problematic areas when it concerns Maya's skin materials):
MAYA'S DEFAULT MAPS (DT YOLANDA):
View attachment 3427112
MAYA'S MATERIALS REWORKED ONLY REMOVING/CHANGING MAPS (NO PHOTOSHOP NECESSARY):
View attachment 3427117
Perfect? Not. But, IMHO, better (those white dots are baked in the diffuse map and could only be removed in a photo editor like Photoshop of GIMP. It's possible to do it and, at the same time, retain Maya's characteristics, but it's more worksome).