Haha, sometimes they peck when there's no scabs either. A curiosity peck I guess, wish there was a way to discourage the behavior without making them scared of me.
My pullets are very friendly but I had a very weird and kinda gross experience today. One of my chickens pecked a scab off my leg and when they seen blood they all came running to get a piece of my leg. What the heck?!?!? How do I get them to not do that???? Gross and ouch.....