Milia en plaque tends to occur randomly in healthy skin and currently has no known cause. Though very rare, a condition called milia en plaque causes milia surrounded by areas of raised, red, scaly, itchy skin. Secondary milia may also occur as a side effect of some medications. Secondary milia develop as a result of trauma from events, such as dermabrasion, tissue damage, blistering, and skin inflammation. Primary milia occur randomly, when keratin, a protein that helps harden the outer layer of the skin, becomes trapped under the skin and forms a fluid-filled sac. Milia are firm, raised, painless, white, fluid-filled sacs, between 1–4 mm wide that develop on the surface of the skin. Share on Pinterest Milia causes raised white bumps on the skin. Vitiligo seems to run in families, and most people first notice skin discoloration in their 20s. White patches tend to develop in places exposed to the sun and may develop slowly or spread quickly. It may be an autoimmune condition, where the immune system mistakenly harms healthy cells. Researchers are not sure what causes vitiligo. In people with vitiligo, white skin patches appear in places where the cells that make skin pigment, or color, have been destroyed. Like PA, pigmenting pityriasis alba mostly affects the face and tends to develop in children. It causes bluish-white scaly patches that are outlined by a patch of very light skin. Pigmenting pityriasis alba is a rare though potentially under-reported form of PA. Researchers are not sure what causes PA, but they think it may be a mild form of atopic dermatitis or eczema. PA tends to develop in children between the ages of 3 and 16 and usually affects the face, but can also impact the neck, shoulders, and arms. These patches eventually heal and leave behind faint, white spots. Pityriasis alba (PA) is a relatively widespread, non-cancerous skin condition that causes red, scaly, itchy patches. The condition is widespread, and symptoms tend to become more noticeable in warm, humid environments. Sometimes, symptoms of TV may only be noticeable when a person has a suntan. These patches usually grow fairly slowly and often cluster together. The fungus causes dry, scaly, itchy patches that are either lighter or darker than surrounding skin. In people with tinea versicolor (TV), the fungus that usually lives on the skin’s surface grows out of control. Tinea versicolor, or pityriasis versicolor While overexposure to the sun without protection can contribute to the risk of skin cancer, sunspots in themselves do not suggest the development of cancer. However, they are harmless, and treating them is a cosmetic issue. They are more likely to appear after the age of 40 years. Causes might include a lack of a skin pigment called melanin. Researchers are not sure what causes sunspots. These spots usually cause no symptoms, are 1–3 millimeters (mm) in size, and tend to appear first on the legs before progressing to the arms, upper back, and face. Sunspots are white spots where skin pigment has been lost. Image credit: Grook Da Oger, (2011, July 22) Share on Pinterest Tinea versicolor, or pityriasis versicolor, causes white patches on the skin.
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