  We study the masses charged by $(dd^cu)^n$ at isolated singularity points of
plurisubharmonic functions $u$. It is done by means of the local indicators of
plurisubharmonic functions. As a consequence, bounds for the masses are
obtained in terms of the directional Lelong numbers of $u$, and the notion of
the Newton number for a holomorphic mapping is extended to arbitrary
plurisubharmonic functions. We also describe the local indicator of $u$ as the
logarithmic tangent to $u$.
