The species of ringworm which affects pigs is Trichophyton mentagrophytes. The clinical signs are brown, circular, slowly enlarging areas on back, flank and behind ears with low level pruritus (itchiness) and alopecia (hairloss). These lesions are found across all age groups, since environmental spores are the main source of infection. The condition is probably unimportant to the pig but infection can pass to humans, and care should be taken when handling infected animals. The disease is self-limiting, although progression through a herd may take weeks or months. Lesions can be washed with chlorhexidine, or off-license use of Imaverol wash.
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Whilst every effort is taken to ensure the accuracy and completeness of the information provided, your specific circumstances must be discussed before advice can be given.