Benign ulcer changes
An ulcer is a localized defect or ulcer on the surface of the skin or mucous membranes. The surface is often covered with pus, necrotic tissue, or crusts, and scars are left after healing. It can be caused by infection, trauma, nodules, or tumor ulceration. Its size, shape, depth, and development process are also inconsistent. Mouth ulcers can be divided into benign and malignant.
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