Crystalline miliaria is due to obstruction to
Miliaria crystallina is caused by obstruction of the sweat ducts close to the surface of the skin Miliaria rubra, caused by obstruction of the sweat ducts deeper in the epidermis; Miliaria profunda, the result of sweat leaking into the middle layer of skin (dermis). Ref Harrison20th edition pg 1207
Sweat gland
Sebaceous glands
Accessory sweat gland
Hair roots
Anatomy of skin