Lebesgue points of functions in the complex Sobolev space

Let $\varphi$ be a function in the complex Sobolev space $W^*(U)$, where $U$ is an open subset in $\mathbb{C}^k$. We show that the complement of the set of Lebesgue points of $\varphi$ is pluripolar. The key ingredient in our approach is to show that $|\varphi|^\alpha$ for $\alpha \in [1,2)$ is locally bounded from above by a plurisubharmonic function.