In the published literature, we could only find one other report describing BF immune cells in mucocutaneous disease in the context of Mp infection, which reported “elevated CD4+ /CD8+ (697/558 × 105/L) T cells with absence of B cells” in a pediatric patient with widespread epithelial detachment of the skin, reminiscent of SJS/TEN [33]. Here, CD8A is linked to toxic epidermal necrolysis.