Additionally, in this research, we collected the levels of CD3+ / CD4+ Th cells in these patients with OLP and found that the Th values of patients with OLP and positive Candida infection were 27–35 (Th normal range as 27–51), with an average of 33.27, relatively lower than the rest average 37.40 within the normal value as 38–46. This evidence concerns the gene CD4 and oral lichen planus.