| • | blockage of eccrine duct at various levels is the immediate cause |
| • | no agreement on why the sweat escapes at different levels causing different subgroups; or what causes the ductal blockade |
Miliaria crystallina
| • | superficial, subcorneal, non-inflammatory vesicles (can literally wipe them off) |
| • | classically in a newborn |
Miliaria rubra
| • | when obstructed sweat migrates into living layers of the epidermis, as well as upper dermis |
| • | causing pruritic inflammatory papules around the sweat pores |
| • | disappears after one day in cool environment |
| • | anhidrosis associated with miliaria takes two weeks to resolve (time needed to repair affected sweat duct unit by epidermal turnover) |
| • | miliaria pustulosa: some eruptions of miliaria rubra become pustular |
Miliaria profunda
| • | results when sweat leaks into the dermis |
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