It is natural for people to stare when we see something unusually or new?

Today I saw someone that had what I believe was psoriasis on their legs. I've never seen it before and although it wasn't attractive to look at I couldn't look away. They were standing in front of us so it wasn't like I was staring rudely or anything. My friends looked once and seriously never looked again. When you see something new or different even if its not easy on the eyes aren't you interested in examing what you just looked at? I feel like if I didnt look I would wonder what I just saw.