Occupational acne
Encyclopedia
Occupational acne is caused by several different groups of industrial compounds, including coal tar
Coal tar
Coal tar is a brown or black liquid of extremely high viscosity, which smells of naphthalene and aromatic hydrocarbons. Coal tar is among the by-products when coal iscarbonized to make coke or gasified to make coal gas...

 derivatives, insoluble cutting oils, and chlorinated hydrocarbons (chlornaphthalenes, chlordiphenyls, and chlordiphenyloxides).
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