STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blackhead. Coloured scanning electron micrograph (SEM) of a blackhead attached to hairs. The blackhead consists of dead cells and debris, which caused an obstruction in the hair follicle. Blackheads and pimples form when sebum (sebaceous oil) builds up behind this blockage. Magnification: x27.5 when printed 10 centimetres wide.
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