Lichens grow in three forms on these arboreal substrates. Some are crustose. These are in close contact with the bark; almost like paint. Others are foliose and look like leaves. And there are the ...

What Is Oral Lichen Planus? Oral lichen planus is a long-lasting disease that affects your mouth, causing symptoms such as painful white patches, redness, and swelling. It doesn't go away ...