  In this paper, we revise Monti's results on the blow-ups of H-perimeter
minimizing sets in $\mathbb{H}^n$. Monti demonstrated that the Lipschitz
approximation of the blow-up, after rescaling by the square root of the excess,
converges to a limit function for $n \ge 2$. However, the partial differential
equation he derived for this limit function $\varphi$ through contact variation
is incorrect. Instead, the correct equation is that the horizontal Laplacian of
the limit function $\varphi$ is independent of the coordinate $y_1$ and solves
equation 1 weakly.
