What are sun spots and should I be concerned?
The question
I’m 34 and have pretty great skin. But I’ve noticed a few sun spots on my hands over the past few months. What are they, and should I be concerned?
The answer
Sun spots are also known as age spots or liver spots, and in medical terms we call them solar lentigos.
They are caused by exposure to natural and artificial (for example, tanning booths) ultraviolet light. In response to UV light, cells in the skin called melanocytes produce increased amounts of pigment known as melanin.
While this increase in pigmentation is meant to protect your skin from the sun, the accumulation of melanin due to chronic sun exposure can lead to the development of these dark spots over time.
They are similar to freckles, but sun spots aren’t likely fade in the winter. They are also formed after years of exposure to sun, while freckles can be present at birth or in early life and aren’t necessarily related to sun exposure.
Most often, a sun spot will be flat with smooth borders and evenly coloured. They are most commonly found in areas that receive the most sun: your face, neck, hands, arms and shoulders. Because they are due to chronic sun exposure, they are more commonly found in adults over 40 – but it is possible to see them in younger individuals as well. They are more common in those with fair complexions.
On their own, sun spots are not a reason for concern – they are benign. But they do indicate sun damage to your skin, which is a known risk factor for the development of skin cancer.
Sunscreen and sun protection can prevent the development of solar lentigo but will not cure those already in place.
Remember, not all skin changes will be benign. If your spots are changing in colour, shape or size, seek advice from your doctor to ensure that it’s not something more serious.
Send family doctor Sheila Wijayasinghe your questions at doctor@globeandmail.com . She will answer select questions, which could appear in The Globe and Mail and/or on The Globe and Mail web site. Your name will not be published if your question is chosen.
Melanin How To Increase - News
In response to UV light, cells in the skin called melanocytes produce increased amounts of pigment known as melanin. While this increase in pigmentation is meant to protect your skin from the sun, the accumulation of melanin due to chronic sun exposure
The indoor tanning industry has fought back over the years, claiming that only the UVB rays (short “burning rays”) increase skin cancer risk; and indoor tanning products (tanning beds, tanning lamps, tanning booths, etc) only use the UVA (long (tanning
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The skin tans when UV radiation is absorbed, causing an increase in the activity and number of melanocytes, the cells that make the pigment melanin. Melanin helps to block out damaging rays up to a point, which is why people with naturally darker skin
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Molecular switch controls melanin production, may allow true ...
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Discovery of a molecular switch that turns off the natural process of skin pigmentation may lead to a novel way of protecting the skin – activating the tanning process without exposure to cancer-causing UV radiation. In their report in the journal Genes & Development, researchers from the Massachusetts General Hospital (MGH) Cutaneous Biology Research Center (CBRC) describe how blocking the action of this switch – an enzyme called PDE-4D3 – in the skin of mice led to a significant increase in melanin production.
“The primary goal of inducing melanin production in human skin would be prevention of skin cancer, since all the common forms are known to be associated with UV exposure, ” explains David Fisher, MD, PhD, director of the hospital’s Department of Dermatology and an investigator at the MGH CBRC, who led the study. “Not only would increased melanin directly block UV radiation, but an alternative way to activate the tanning response could help dissuade people from sun tanning or indoor tanning, both of which are known to raise skin cancer risk.”
In 2006 Fisher’s group showed that the metabolic pathway leading to UV-induced pigmentation is controlled by cyclic AMP (cAMP), a molecule known to regulate many important cellular processes by carrying messages from the cell surface to internal target molecules. Using a strain of transgenic mice with red hair and melanocytes in their epidermis – common mice have none of these melanin-producing cells in the outer skin layer – they found that inducing cAMP production in the animals’ skin led to significant pigmentation. But since the drug used in that study cannot penetrate human skin, they needed to investigate an alternative approach.
Because most drugs act by blocking rather than stimulating their target molecules, better defining the pathway leading from UV exposure to melanin production could identify a step limiting melanin expression that, if suppressed, would increase production of the pigment. The strength and duration of the signals carried by cAMP are controlled by PDE enzymes, which break down the molecule after its message is delivered. Detailed analysis of the melanin expression pathway identified PDE-4D3 as the regulator of cAMP activity in melanocytes. The transcription factor activated by cAMP induces production of both melanin and PDE-4D3, and the enzyme in turn modulates the pigmentation process by breaking down cAMP.
Melanin How To Increase - Bookshelf
Dermatology
Sometimes there is an overproduction of melanin, but no increase in melanocy tes . ... Because lesions with a focal increase in melanin are often clinically ...Melanins and Melanosomes, Biosynthesis, Biogenesis, Physiological, and Pathological Functions
sonably well using linear regression demonstrating that melanin content ... ratio of the outer/inner choroidal melanin density to increase with age [21]. ...Peptide Receptors
Varas M, Perez M, Ramirez O, de Barioglio SR (2002): Melanin concentrating hormone increase hippocampal synaptic transmission in the rat. ...International journal of quantum chemistry, Quantum biology symposium
If in retinitis pigmentosa there is an aberration in the CA system (especially in DA), then an increase in melanin and a degeneration both could result. ...The health of former prisoners of war, results from the medical examination survey of former POWs of World War II and the Korean Conflict
Ultraviolet light, heat, trauma, and a variety of topically applied chemicals can stimulate melanin production and increase skin pigmentation, ...Gold Information Directory
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How to Increase Melanin in the Body. Melanin is like the crayon box of our body. It is the substance that largely determines the color of our skin, our hair, and our ...
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How to increase melanin, increase,melanin,improve,skin,color ... In order to improve skin color you should use such type of products which increase the ...
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