Terry,
Has mom tried covering the moles, for example with a band-aid, long enough to
break the habit?  Another suggestion, which worked wonderfully for me, is
distraction with a small stuffed animal.  When my youngest, now 13, was
between 1 and 2, she had an annoying habit of playing with the other nipple
during the bf session.  I'm sure it helped with a quicker MER but nearly
drove me up the wall!  And discreet nursing in public WASN'T!!  I bought a
little sutffed teddy bear and she would hug that bear and leave my breast
alone while nursing.  Perhaps something along that line might be helpful to
your mom.

Kathy Parkes, RN, IBCLC
San Antonio, TX