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Miliaria, commonly known as heat rash, sweat rash, or prickly heat, [1] is a skin disease marked by small, itchy rashes due to sweat trapped under the skin by clogged sweat-gland ducts. Miliaria is a common ailment in hot and humid conditions, such as in the tropics and during the summer. [ 2 ]
Fox–Fordyce disease (FFD) is a chronic blockage of the sweat gland ducts with a secondary, non-bacterial inflammatory response to the secretions and cellular debris in the cysts. [1]
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Morphea profunda involves deep subcutaneous tissue, including fascia, and there is a clinical overlap with eosinophilic fasciitis, eosinophilia-myalgia syndrome, and the Spanish toxic oil syndrome. [ 3 ] : 171 Morphea profunda shows little response to corticosteroids and tends to run a more chronic debilitating course.
Relative incidence of cutaneous cysts. Milia is labeled at bottom right.. A milium (pl.: milia), also called a milk spot or an oil seed, [1] is a clog of the eccrine sweat gland.
Erythromelanosis follicularis faciei et colli is characterized by patches of erythema (with or without telangiectasia), follicular papules (follicular plugging), and bilateral and symmetrical hyperpigmentation (reddish-brown pigmentation) that start on the preauricular areas and cheeks and can eventually migrate to the submandibular portions of the neck.
The pathogenesis of pseudopelade of Brocq is still not well understood. A number of potential contributing variables include senescence of the follicular stem cell reserve, acquired autoimmunity, and Borrelia infection. [3]
Pressure alopecia, also known as postoperative alopecia, and pressure-induced alopecia, [1] occurs in adults after prolonged pressure on the scalp during general anesthesia, with the head fixed in one position, and may also occur in chronically ill persons after prolonged bed rest in one position that causes persistent pressure on one part of the scalp, all likely due to pressure-induced ischemia.