thanks! Yeah, its not even the white of the boot, it's the sole
I knew what you meant - it's normal. While the lunge itself is properly done with the upper on the ice, the edge of the sole gets scraped as you enter/exit the lunge. The suggestion about sno-sealing is important because the scrape exposes fresh leather to water.
Just for future reference, it's normal for the boots to get scratches, gouges, scrapes and nicks. My specialty as a beginner was the "accordian skin," where the white upper is scraped off into a little folded pile. (BTW, leather is painted, so under the white paint is grey or brown leather.)
Skates are your equipment so use them and keep them maintained, but don't worry too much about blemishes. They don't affect your skating.