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→Pathogenesis
==Pathogenesis==
==Pathogenesis==
*Epidermal hyperplasia ([[Skin Glossary - Pathology|hyperkeratosis, parakeratosis, acanthosis]]) and inflammation
*Epidermal hyperplasia ([[Skin Glossary - Pathology|hyperkeratosis, parakeratosis, acanthosis]]) and [[Inflammation - WikiBlood|inflammation]]
*Superficial perivascular dermatitis -> exocytosis (migration through epidermal layers) -> intracorneal microabscesses
*Superficial perivascular dermatitis -> exocytosis (migration through epidermal layers) -> intracorneal microabscesses
*Normal -> eruptive nodular -> pseudomycetoma -> onychomycosis
*Normal -> eruptive nodular -> pseudomycetoma -> onychomycosis
*Secondary invasion by ''Staphylococcus aureus'' and ''Staphylococcus intermedius'' are common and cause pustules in the hair follicles
*Secondary invasion by [[Staphylococcus spp.|''Staphylococcus aureus'']] and [[Staphylococcus spp.|''Staphylococcus intermedius'']] are common and cause pustules in the hair follicles
*Grossly:
*Grossly:
**Alopecia due to broken hair shafts and hairs lost from inflammed follicles
**Alopecia due to broken hair shafts and hairs lost from inflammed follicles
**Follicular papules and pustules
**Follicular papules and pustules
**Peripheral red ring ('''ringworm''') due to dead fungi in areas of inflammation at centre of lesions and viable fungi peripherally
**Peripheral red ring ('''ringworm''') due to dead fungi in areas of [[Inflammation - WikiBlood|inflammation]]
at centre of lesions and viable fungi peripherally
*More common in housed animals, rather than animals turned out to pasture
*More common in housed animals, rather than animals turned out to pasture