Possible anime with forest people

I am thinking this movie or tv show was made in the 80’s or 90’s. From what I remember there were these small people living in the forest? I know they were small because there were mushrooms bigger than them and I think they lived inside a tree. Anyways the main thing I remember about the movie is that there was someone who ventured out and fell in a hole where he hurts his knee. It looked all skinned up. When he gets rescued they out leaves or something in his leg to heal it. I know it was animated but I’m thinking it was anime because if the skectchyness of the people. Please help me!

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