This image is a close view of a patch of skin that exhibited a number of pustular lesions in the case of a veterinarian with cutaneous listeriosis.
”Listeriosis, a serious infection usually caused by eating food contaminated with the bacterium Listeria monocytogenes, is an important public health problem in the United States. The disease primarily affects older adults, pregnant women, newborns, and adults with weakened immune systems. However, rarely, persons without these risk factors can also be affected. The risk may be reduced by following recommendations for safe food preparation, consumption, and storage.”
For more on listeriosis, see the link below.