Fox Fordyce's disease is a disease of –
Diseases of Sweat glands

Eccrine glands         →         Hyperhydrosis, Anhydrosis, Miliaria.
Apocrine glands       →         Chromhidrosis (coloured sweat), Osmidrosis (offensive sweat odour), Bromhidrosis (hyperhidrosis + offensive odour), Fox - Fordyce's disease (apocrine miliaria), hidradenitis suppurativa.
Eccrine glands
Apocrine glands
Sebaceous glands
Pilosebaceous glands