The importance of external parasites in pig production varies greatly among regions because of differences in climate and systems used to raise pigs. Sarcoptic mange caused by Sarcoptes scabiei var suis is the most important external parasite of pigs worldwide. Other external parasites include demodectic mites, lice, fungi, and ticks.
External parasites produce a range of clinical signs in pigs including rubbing, scratching, and skin lesions. Some parasites also cause significant economic effects due to reduced growth rate, reduced feed efficiency, and loss of carcass value at slaughter.