Piebald axolotls are very similar to "Dirty" Leucistics (see leucistic section).  They tend to be white or light pink in color with red or pink gills.  They have dark eyes and patches of dark grey or black on their face.   What makes them different from dirty lucys is that these dark patches extend down the back, while with the leucistics, we typically see dark freckling limited to the face.   The pigmentation of a dirty leucy is far more "superficial" when looking at the skin.  The dark patches of Piebalds take on a mottled subcutaneous display.   In very rare piebald specimens, the dark patches will even extend down their sides and legs.  The piebald pattern is usually only isolated to the upper top half of the body.