I would thoroughly wash my hands with unscented soap. so many people used
some type of scented soap she may be confused and think your hand is food. you say adopted so if they are rehomed, maybe they are used to eating a treat out of someones hands, and they think they are getting some food.
or they could be doing some type of grooming, mine do it on my arm, find a nice
spot, start to groom gently then go full on hard groom, if left alone they will start to break skin and make me bleed.
www.youtube.com/watch?v=vO3PcmSh55I&t=3s