One of mine does this. Kizzy had a poorly eye a while ago and Charlotte would lick it quite alot and we had to keep a close eye on her. I think she knew there was a problem and was trying to groom it better, like when some pigs try to groom buttons off tops because they don't think they should be there. Kizzy got better and Charlotte doesn't do it as much now but I think it is a habit she is finding hard to break. It doesn't bother Kizzy and if it started to then I think she would let Charlotte know rolleyes
Has anything changed with your piggies that could trigger this? Is it annoying the one being licked? Have you checked that there is nothing wrong with the eye that could be attracting the unwanted attention?
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