Malaseb is registered to treat Seborrhoeic Dermatitis and Dermatophytosis. Seborrheic Dermatitis is the scientific name for a skin infection involving bacteria (Staphylococcus) and yeast (Malassezia).
Dermatophytosis is the scientific name for ringworm, a condition which is not due to worms (like the name suggests) but is in fact a fungal infection.
It is normal in dogs to have low numbers of resident bacteria and yeasts on the skin surface. When there is a disruption to the skin’s natural ecosystem these bacteria and yeasts can overgrow causing disease.