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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. It is a keratin-filled cyst that may appear just under the epidermis or on the roof of the mouth. [2] [3]: 780 Milia are commonly associated with newborn babies, but may appear on people of any age.
Eruptive vellus hair cysts (or EVHC) are small lesions that occur most often in the chest wall, abdomen and extremities, often with a crusted surface. EVHC may occur randomly, or it can be inherited as an autosomal dominant trait; sporadic cases usually appear at 4–18 years of age.
This is a shortened version of the twelfth chapter of the ICD-9: Diseases of the Skin and Subcutaneous Tissue. It covers ICD codes 680 to 709. The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
Acne (/ˈækni/ ACK-nee), also known as acne vulgaris, is a long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles. [10] Typical features of the condition include blackheads or whiteheads , pimples , oily skin, and possible scarring .
The dermis is the layer of skin between the epidermis and subcutaneous tissue, and comprises two sections, the papillary dermis and the reticular dermis. [10] The superficial papillary dermis interdigitates with the overlying rete ridges of the epidermis, between which the two layers interact through the basement membrane zone. [ 10 ]
Miliaria occurs when sweat glands become clogged due to dead skin cells or bacteria such as Staphylococcus epidermidis, [9] a common bacterium that occurs on the skin, which is also associated with acne. The trapped sweat leads to irritation (prickling), itching, and a rash of very small blisters, usually in a localized area of the skin.
[9] [2] Cutibacterium acnes is the suspected infectious agent in acne. [3] It can proliferate in sebum and cause inflamed pustules (pimples) characteristic of acne. [3] Nodules are inflamed, painful, deep bumps under the skin. [3] Comedones that are 1 mm or larger are called macrocomedones. [10]
Acneiform eruptions, or acne mimicking eruptions, are a group of skin conditions characterized by small bumps resembling acne. [1] Typically, these bumps are mostly of similar size. [1] Some bumps may be bigger or contain fluid. [2] Generally, blackheads and whiteheads are absent. [2]