Sjogren's, as I remember it, is a histopath diagnosis of exclusion... at best you would get a reading that says "compatible with...".
Not really - Sjogren's can be diagnosed (or at least suggested) on an adequate lower lip biopsy based on a count of clusters of lymphocytes in a certain area within the minor salivary gland. Lower lip biopsies are done as a diagnostic aid when Sjogren's is in the differential. It is not a biopsy of a lesion, and the only significant finding is whether there is sjogren's or not (usually).
Anything can cause acute and chronic inflammation. It is a nonspecific phrase that pathologists use when the diagnosis is not apparent. If the findings were specific for something, they would say it.
If this post is about your own personal lip biopsy (which it probably is because you're a new poster and this is your first post) and you are looking for medical advice, you need to talk to your own doctor. SDN is not the place for medical advice.