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sjogren syndrome salivary glands usg syphilis leprosy tb bacterial infections fungal bacterial viral salivary gland swellings nup nug kaposi sarcoma oral hairy leukoplakia recurrent aphthous ulcers oral manifestatons of hiv oral candidiasis aids hiv lichen planus immunofluorescence pemphigus vulgaris hyper sensitivity immunodeficiency sle scleroderma immunity auto immune diseases immune mediated lesions cyclo oxygenase pathway leukotrienes prostaglandins arachidonic acid metabolites chemotaxis complement pathway extrinsic pathway intrinsic pathway free radicals types of inflammation chemical mediators of inflammation macrophages leucocytes phagocytosis cellular events vascular events acute inflammation