Question

1. what is the name of the fungus that causes pityriasis, the technical term for dandruff? explain how it causes dandruff, and list three other factors that can affect dandruff. 14. what type of agent (ingredient) is contained in antidandruff shampoos? how is it used to control dandruff?

Explanation:

1. The fungus that causes pityriasis (dandruff) is Malassezia. It causes dandruff by breaking down sebum on the scalp, producing free - fatty acids which irritate the scalp and cause flaking. Other factors include oily skin, stress, and certain skin conditions.
2. Common agents (ingredients) in antidandruff shampoos include zinc pyrithione, selenium sulfide, and ketoconazole. Zinc pyrithione inhibits the growth of Malassezia, selenium sulfide reduces the fungus population and also has anti - inflammatory properties, and ketoconazole is an antifungal that directly targets Malassezia.

Answer:

1. The fungus is Malassezia. It causes dandruff by metabolizing sebum and producing irritating free - fatty acids. Other factors: oily skin, stress, skin conditions.
2. Ingredients like zinc pyrithione, selenium sulfide, ketoconazole are used. Zinc pyrithione inhibits fungus growth, selenium sulfide reduces fungus and has anti - inflammatory effects, ketoconazole is an antifungal.