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The most common substance injected was paraffin, n = 112 (47.7%) out of 235 patients with data, and the second commonest substance was silicone, n = 37 (15.8%)

They attribute the association to restricted B12 intake hampering the "normal functioning of immune and neuropsychologic system", which has a role to play in halting the development of oral lichen planus

Burgoyne RD, Morgan A (2003) Secretory granule exocytosis
Molecular mechanisms of intervertebral disc degeneration induced by Propionibacterium acnes
It feels like a minor detail, a footnote in a complex research protocol

Why Vitamin Injections