Malaseb is registered to treat Seborrhoeic Dermatitis and Dermatophytosis. Seborrhoeic 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 skins surface. When there is a disruption to the skin's natural ecosystem these bacteria and yeasts can overgrow causing disease.
Reasons for disruption to the natural balance
Allergy, including to pollens, grasses, foods (meats) and fleas.
Parasites, such as fleas, mites and lice.
Hormonal problems
Conformational problems such as deep skin folds, making sweaty crevices.

How does Malaseb help?
Kills the micro-organisms, helping to keep the numbers of yeasts and bacteria at manageable levels.
Removes excess scale and oils, commonly produced when the skin is infected
Removes allergens such as pollens which can be caught in fur or on skin causing irritation