Why did Michael change his face?

I'm intrigued by the mention of Michael changing his face. Can you elaborate on the context behind this decision? Was it a personal choice, or was there some external pressure at play? Did he have any specific motivations or reasons for making such a drastic change? Additionally, how did this change affect his life and relationships with others? It's a fascinating topic, and I'm eager to learn more about the whys and hows behind Michael's decision.