Question
A patient has a history of developing the following type of skin lesions during hot and humid climate.Regarding the pathophysiology of this condition,which of the following staement is true?
A. Photodermatitis.
B. Allergic reaction.
C. Blockage of the sebacceous ducts.
D. Blockage of the sweat ducts.
Show Answer
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Correct Answer » D
Explanation
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Ans :D. Blockage of the sweat ducts
MILIARIA
- Miliaria is a common disorder of the eccrine sweat glands that often occurs in conditions of increased heat and humidity.
- Miliaria is thought to be caused by blockage of the sweat ducts, which results in the leakage of eccrine sweat into the epidermis or dermis.
- Results from blockage of the acrosyringium, the long thin duct that carries sweat from the coiled secretory portion located in the reticular dermis and the subcutaneous fat to the skin surface
- There is secondary leakage of sweat in the epidermis and papillary dermis.
Types
Miliaria crystalline (sudamina)
- Obstruction is superficial in stratum corneum
- It is common in infants in warm ICU conditions where cholinergic & adrenergic agents are employed.
Miliaria rubra (prickly heat):
- Leakage of sweat into epidermis & upper dermis
- Papules around sweat pores
- Miliaria pustulosa: miliaria rubra becoming pustular
Miliaria profunda
- Obstruction of acrosyringium at deeper level
- Sweat leaking into deeper dermis
