The World Federation One Stop Fiqh

Ruling 217

Those parts of the lips and eyelids that overlap when shut are ruled as being inner parts of the body. Therefore, in the event that they come into contact with some external impurity, it is not necessary to wash them with water.24 However, with regard to those parts that one does not know whether they are outer or inner parts of the body, if they come into contact with external impurity, it is necessary to wash them.

24 In light of Ruling 215, they become pure by removing the impurity from them and so if this is done, there is no need to wash them with water.