Exudative Epidermitis in Pigs: Signs, Treatment & Prevention

Exudative epidermitis is a contagious bacterial skin disease of pigs, often called greasy pig disease. It is most commonly linked to Staphylococcus hyicus, a bacterium that can live on pigs without causing problems until the skin barrier is damaged. Once it gets into small abrasions, it can produce toxins that separate skin cells and lead to oozing, crusting, and the classic greasy appearance.

Young piglets are affected most often, especially suckling pigs and pigs around weaning. Older pigs usually develop more resistance with age, but they can still carry the bacteria and spread it to younger animals. In herd settings, outbreaks can move quickly when pigs are crowded, mixed, or housed on rough surfaces.

This condition is more than a cosmetic skin problem. Affected pigs can become painful, stop eating, lose fluids through damaged skin, and fall behind in growth. In severe cases, dehydration and weakness can become serious very fast, so early veterinary care matters.

The main cause is infection with Staphylococcus hyicus. This bacterium usually needs a break in the skin to cause disease. Small abrasions from fighting, rough flooring, sharp edges, poor pen surfaces, or rubbing can give the bacteria a way in. New concrete and other abrasive housing materials are classic risk factors.

Several herd and piglet factors can make outbreaks more likely. These include crowding, earlier weaning, poor hygiene, high humidity, poor ventilation, and skin damage from parasites such as mange mites. Nutrition and immune status also matter. Piglets from gilts may be at higher risk because they may receive less protective immunity than piglets from older, previously exposed sows.

Carrier animals are important too. Older pigs, sows, and boars may carry the organism on the skin or in the reproductive tract without obvious disease. That means a healthy-looking herd can still expose vulnerable piglets, especially during birth, in the farrowing area, or after mixing at weaning.

Your vet will usually start with the pig's age, history, housing, and the appearance of the skin lesions. In many cases, exudative epidermitis is diagnosed presumptively from the clinical picture, especially when a young piglet has red skin that quickly becomes greasy and crusted around the face and feet.

If confirmation is needed, your vet may collect samples from skin lesions for bacterial culture and, when possible, antimicrobial susceptibility testing. This can be especially helpful in herd outbreaks, recurrent cases, or situations where treatment has not worked as expected. Resistance can occur, so culture can help guide a more targeted plan.

Your vet may also rule out other conditions that can look similar, including mange, lice, swine pox, parakeratosis, ringworm, and vesicular diseases. In severe or unusual cases, additional diagnostics may be recommended to assess dehydration, secondary infection, or broader herd health concerns.

Prevention focuses on protecting the skin barrier and lowering bacterial pressure. Start with the environment. Pens should be clean, dry, and well ventilated, with flooring and fixtures that do not scrape or cut the skin. Reducing crowding and avoiding unnecessary mixing can also lower fighting and skin trauma, especially around weaning.

Parasite control matters because mange and other skin irritants can create the openings that bacteria need. Good nutrition, steady access to water, and careful farrowing hygiene also help. In herd settings, thorough cleaning and disinfection between groups can reduce contamination in the environment.

Your vet may also talk with you about sow immunity, gilt management, and whether herd-level tools such as culture-guided treatment plans or autogenous vaccination are appropriate in recurring outbreaks. There is no single prevention plan that fits every farm or pet pig setup. The best approach depends on age group, housing, stocking density, and how often the problem returns.