  We study the different quantum phases that occur in massive ${\cal N}=2$
supersymmetric QCD with gauge groups $SU(2)$ and $SU(3)$ as the coupling
$\Lambda/M$ is gradually increased from 0 to infinity. The phases can be
identified by computing the exact partition function by saddle-points,
combining supersymmetric localization and the Seiberg-Witten formalism. In all
cases, we find two phases, a weak coupling and a strong coupling phase,
separated by a critical point described by a superconformal field theory or
involving superconformal sectors. In crossing the critical point, the dominant
saddle-point hops from one singularity of the curve to another one. The
theories seem to undergo a second-order phase transition with divergent
susceptibility.
