The eyelashes are part of the body mesh. This causes significant workflow issues in Substance Painter, making it difficult to paint the eyes. Having the eyelashes as a separate object would greatly improve texturing flexibility.
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+1
This is becoming a major problem for painting. My work around is just exporting an fbx from ZBrush without the eyelashes.
[EDIT] My kid just came up with a much better workaround. Export the obj for substance from CC3/4/5 and then load it into your DCC of choice and delete the offending UDIM island. Then save it back out. Works in both Maya and Blender.