TL;DR: Foul-smelling skin fold discharge in cats signals a bacterial or yeast infection that requires a veterinary exam within 24–48 hours. Early treatment is essential to prevent deepening infection, skin erosion, and significant pain.
What causes foul-smelling skin fold discharge in cats?
When moisture, heat, and friction are trapped within a cat's skin folds, it creates a breeding ground for bacteria and yeast. This condition is known as skin fold dermatitis, or intertrigo. The foul-smelling discharge you notice is typically a byproduct of these microorganisms overpopulating the area. This is most common in overweight cats or breeds with flat faces and extra skin, such as Persians.
How urgent is it if my cat has a discharge in their skin folds?
- Foul-smelling discharge indicates an active infection that requires professional medical attention.
- While generally not an immediate life-threatening emergency, it is considered a medium-priority concern.
- You should schedule a veterinary appointment within the next 24 to 48 hours.
- Delaying treatment can lead to the infection deepening, causing significant pain, skin erosion, or the formation of an abscess.
How does a photo of the discharge help my veterinarian triage my cat?
- A clear image allows the vet to see the color and consistency of the discharge before the area is disturbed during a physical exam.
- It helps the medical team assess the level of redness and inflammation to determine the urgency of the case.
- Photos prepare the vet to select the most appropriate diagnostic tests, such as skin cytology, ahead of your visit.
Clinical Context (Merck Veterinary Manual)
In cats, skin fold dermatitis, such as cheilitis, can present with a foul odor, excessive salivation, and potential anorexia. Chronic infection of skin folds is characterized by discolored, moist, and matted hair with a thick, yellowish or brown, malodorous discharge overlying hyperemic and sometimes ulcerated skin. Superficial pyoderma, often due to Staphylococcus spp., may also be present, particularly in cats with allergic skin diseases, parasitic diseases, or feline chin acne. Diagnostic efforts should address underlying causes, and a detailed history, physical examination, and appropriate diagnostic tests are crucial for definitive diagnosis.
Chapter: Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 364)