In Yogananda’s Autobiography of a Yogi, it is written that his skin was observed to be glowing when they were in the sea, in the water. He was walking with God/in the path of God (meaning of Brahmacharya), in my opinion. My enlightened teacher also had mentioned this book as a resource to learn more about the spiritual path. I have observed white and lately golden color near his head region. I think the first example is direct observation of skin glow and the second is more related to becoming more sensitive to be able to perceive auras. The true benefit of sincerely going the Brahmacharya path is God realization, which includes realizing all your desires can and will come true just the way you are creating them.