Favus is type of:
Kerion, us, black dot, grey patch are all type of Tinea capitis. Tinea capitis broadly divided into - Inflammatory(kerion, us) causing scarring/cicatrizial alopecia or Non inflammatory( black dot , grey patch) causing non scarring/Non cicatrizing alopecia
Tinea capitis
Alopecia areata
Pityriasis rosea
Non Cicatrizing alopecia
Fungal infections