TEM of an erythema toxicum lesion. (a) Overview showing the hair follicle containing hair cortex (H) surrounded by epithelial cells. One cell contains bacteria in the cytoplasm (arrow). (b) High magnification of cell in (a) showing a coccus-like bacteria with pili structures in the cytoplasm of an epithelial cell. (c) Overview of connective tissue (C) and epithelial cells in the hair follicle containing a cell with bacteria in the cytoplasm (arrow). (d) Higher magnification of cell in (c). (e) A phagosome body in the cytoplasm of a macrophage/dendritic cell containing bacteria-like material (arrow). (f) Three individual bacteria in the cytoplasm of epithelial cells in the hair follicle. N, nucleus. Bar: 15 μm (a), 10 μm (c), 1 μm (b, d, e, f).