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Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [2] such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas.
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When you look in the mirror, and see hair that’s dry and frizzy, does this mean it's damaged? And if not, what does damaged hair look like?
Acquired hypertrichosis lanuginosa is characterized by rapid growth of lanugo hair, particularly on the face. [12] [13] Hair also appears on the trunk and armpits, while palms and soles are unaffected. [13] The excess hair is commonly referred to as malignant down. [13] This hair is very fine and unpigmented. [13] Generalized hypertrichosis
If at least 50% of the hairs removed is at the anagen hair stage, the outcome of the pull test is positive. [7] [10] The detachment of only 4-6 hairs is considered a normal outcome, as approximately 10% of the hairs on the scalp are at the telogen stage. The removed loose anagen hairs are not fragile and are of normal tensile strength. [7]
Uncombable hair syndrome (UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [4] It was first reported in the early 20th century. [5] It typically becomes apparent between the ages of 3 months and 12 years. [6]
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Monilethrix (also referred to as beaded hair) [1] is a rare autosomal dominant hair disease that results in short, fragile, broken hair that appears beaded. [2] [3] It comes from the Latin word for necklace (monile) and the Greek word for hair (thrix). [4] Hair becomes brittle, and breaks off at the thinner parts between the beads.