Cats can get a condition called miliary dermatitis, which is the descriptive term used for a cutaneous reaction pattern of focal (localized) or generalized small papules (bumps) or crusts. Miliary dermatitis is not a specific disease. It is secondary to many other diseases.
 
Causes of miliary dermatitis include insect (flea, mosquito, ear mite, etc.) bite hypersensitivity, atopy (sensitivity to aero-allergens such as pollen, mold, house dust mites, etc.), adverse reaction to a food, bacterial superficial folliculitis (inflamed skin follicles), dermatophytosis (fungal disease), feline scabies, mast cell tumors, and pemphigus foliaceus. Flea hypersensitivity is the most common cause of miliary dermatitis.
 
Diagnosis of the root cause of miliary dermatitis may require cytology, skin scrapings, insect control trial, elimination diet, fungal culture, and biopsy.
 
Treatment is based on eliminating or treating the root cause of the miliary dermatitis.