A sequential decrease in tumoral PD-L1 expression, combined tumoral PD-L1 and high intratumoral FoxP3+ cell count, combined tumoral PD-L1 and high intratumoral CD8+ cell count, and combined high intratumoral CD8+ and FoxP3+ cell counts was observed in the virus-positive UP, virus-negative UP, virus-positive KP, and virus-negative KP groups (chi-square p-values = 0.028, 0.00075, 0.014, and 0.049, respectively) (Figure 4). Here, FOXP3 is linked to keratosis pilaris.