Well, epigenetics has often been compared to Neo-Lamarckism in the popular media, but there is an important difference -- in epigenetics the whole point is that

Well, epigenetics has often been compared to Neo-Lamarckism in the popular media, but there is an important difference -- in epigenetics the whole point is that the changes are temporary -- they may persist for a long time -- even across a generation or two -- but eventually things revert to the genetic state. In the various versions of Lamarckism, the changes were thought to be permanent. This matters because it explains why epigenetics can't be an alternative to genetics for evolution.