väike hallikaskollane valuline haavand suu limaskestal, villikesest tekkinud haavand suu limaskestal, a small, white spot or pustule, caused by either viral or fungal infections, that appears in the mouth, on the lips, or in the gastrointestinal tract in certain diseases, as thrush, a small, shallow, painful ulceration that usually affects the oral mucosa, but not underlying bone