Figure 2:Transmission electron photomicrograph of acne scar tissue before irradiation. Numerous outgrowths of elastic fibers can be observed in the superficial dermis in the region of the acne scars. Examination of the specimens stained with oolong tea extract (OTE) reveal the presence of elastin in the elastic fibers as electron-dense spherical or rod-shaped masses. (EF, elastic fiber. Scale bar, 3 μm).