▁re - ex c ised . ▁ ▁Most ▁der mat olog ists ▁and ▁der mat op ath olog ists ▁use ▁a ▁system ▁de vised ▁by ▁the ▁N I H ▁for ▁class ifying ▁mel an oc yt ic ▁les ions . ▁In ▁this ▁classification , ▁a ▁nev us ▁can ▁be ▁defined ▁as ▁ben ign , ▁having ▁at yp ia , ▁or ▁being ▁a ▁mel an oma . ▁A ▁ben ign ▁nev us ▁is ▁read ▁as ▁( or ▁understood ▁as ) ▁having ▁no ▁c yt olog ic ▁or ▁architect ural ▁at yp ia . ▁An ▁at yp ical ▁mole ▁is ▁read ▁as ▁having ▁architect ural ▁at yp ia , ▁and ▁having ▁( m ild , ▁moder ate , ▁or ▁severe ) ▁c yt olog ic ▁( mel an oc yt ic ) ▁at yp ia . ▁ ▁Usually , ▁c yt olog ic ▁at yp ia ▁is ▁of ▁more ▁important ▁clin ical ▁concern ▁than ▁architect ural ▁at yp ia . ▁Usually , ▁moder ate ▁to ▁severe ▁c yt olog ic ▁at yp ia ▁will ▁require ▁further ▁exc ision ▁to ▁make ▁sure ▁that ▁the ▁surg ical ▁margin ▁is ▁completely ▁clear ▁of ▁the ▁les ion . ▁ ▁The ▁most ▁important ▁aspect ▁of ▁the ▁bi ops y ▁report ▁is ▁that ▁the ▁path ologist ▁indicates ▁if ▁the ▁margin ▁is ▁clear ▁( negative ▁or ▁free ▁of ▁mel an oc yt ic ▁nev us ), ▁or ▁if ▁further ▁t issue ▁( a ▁second ▁surg ery ) ▁is ▁required . ▁If ▁this ▁is ▁not ▁mentioned , ▁usually ▁a ▁der mat ologist ▁or