3.Pathogenetic basis Located on the surface,vulnerable Many glands,easy infection ■ Mucocutaneous junction,easy to have disease ■ Thin skin,subcutaneous tissue loose, obvious inflammatory reaction Inflammatory infection common characteristics:red,swelling,heat,pain, dysfunction 3. Pathogenetic basis ◼ Located on the surface, vulnerable ◼ Many glands, easy infection ◼ Mucocutaneous junction, easy to have disease ◼ Thin skin, subcutaneous tissue loose, obvious inflammatory reaction ◼ Inflammatory infection common characteristics: red, swelling, heat, pain, dysfunction