Hair bleaching products can damage hair and cause severe burns to the scalp when applied incorrectly or left on too long.Industrial bleaches that work by reduction (such as sodium hydrosulphite) react with a chromophore, the part of the molecule responsible for its color and decrease the number of carbon-oxygen bonds in it, making it uncoloured. This process might be reversed to a certain extent by oxygen in the air, such as yellowing of bleached paper if kept exposed to air. In contrast hydrogen peroxide chemically alters the chromophore so that it increases the number of carbon-oxygen bonds. Due to the relative absence of reducing agents in the environment, chromophores cannot restore themselves as seen in reduction-based bleaches.Bleaching the hair is a gradual process and different colors could be achieved dependent on the original hair color, application time, and strength of the product used. Applied on black hair, the hair will change its color to brown, red, orange, orange-yellow, yellow, and finally pale yellow. Toner
Toning is a common practice after bleaching to mask the undesirable red and orange tones of "brassy" hair using a toner dye. Through toning, the yellow hue of fully bleached hair can be removed to achieve platinum blond hair. The appropriate color of the toner depends on the color of the bleached hair; e.g. to remove the yellow tones a violet toner dye will be needed, but to neutralize red and orange hues a green and blue toner would be more suitable. Tinted shampoos can also be used to tone hair.
Rarely, they can be associated with Birt–Hogg–Dubé syndrome, acromegaly, or polycystic ovary syndrome.Elevated blood sugar and insulin is linked to an increased incidence of skin tags through an unknown mechanism. Treatment
If removal is desired or warranted, it can be achieved by a dermatologist, general practitioner or similarly trained professional who may use cauterization, cryosurgery, excision, laser, or surgical ligation to remove the acrochorda. Varied home remedies are also available, but most are unproven and some (e.g. tea tree oil) may cause allergic skin reactions. See also
Molluscum contagiosum (a viral disease which is similar in appearance and grows in similar areas)
List of cutaneous neoplasms associated with systemic syndromes
Papilloma
Cutaneous horn

References


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