TL;DR: Hair loss and grey, scaly patches in cats are typically non-emergency issues like ringworm or allergies that require a routine vet visit. Seek immediate care if the skin is bleeding or if your cat becomes lethargic.
What causes hair loss and grey, scaly patches on my cat’s skin?
- Accumulation of dead skin cells or skin thickening due to chronic irritation.
- Fungal infections such as ringworm.
- Parasitic infestations like mites (mange).
- Chronic inflammatory conditions including feline atopy or food allergies.
Is hair loss and scaly skin in cats a veterinary emergency?
- These symptoms are generally considered low-urgency and are rarely life-threatening.
- Schedule a routine veterinary appointment for an accurate diagnosis of itching and discomfort.
- Seek prompt care if the skin begins bleeding or oozing.
- Visit a vet immediately if your cat becomes lethargic or stops eating.
How does a photo of my cat’s skin help with a veterinary triage?
- Allows the triage team to examine the specific pattern of hair loss and the texture of the scales.
- Helps identify visual cues, such as circular patches suggesting ringworm or ear scaling suggesting mites.
- Provides data to help your veterinarian determine how quickly your pet needs to be seen.
- Assists the clinic in preparing the necessary diagnostic tests before you arrive.
Clinical Context (Merck Veterinary Manual)
In cats presenting with hair loss and grey, scaly skin, potential causes include infectious skin diseases (bacterial pyoderma, dermatophytosis), ectoparasites, allergic skin diseases (atopic dermatitis, food allergy, insect hypersensitivity), and, less commonly, neoplastic skin diseases. Symmetric alopecia in cats is often a clinical sign of an underlying pruritic disease, with flea allergy dermatitis being a common cause. Demodicosis can present with focal alopecia, particularly on the head and neck, or as a generalized disease with alopecia, crusting, and secondary pyoderma; generalized demodicosis may be associated with immunosuppressive or metabolic diseases such as feline leukemia virus, feline immunodeficiency virus, diabetes mellitus, or neoplasia. Diagnostic steps should include skin scrapings for Demodex mites and dermatophyte cultures to rule out concomitant infections; a CBC with differential may reveal eosinophilia, suggesting flea allergy dermatitis. Medical evaluation is warranted in cases of generalized disease to investigate underlying systemic conditions.
Chapter: Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 842)