Saturday February 29, 2020

Here’s Why Some Cosmetics May Cause a Skin Rash

These chemicals included Balsam of Peru and farnesol, which are found in many personal care products, such as skin creams, toothpaste, and fragrances

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Cosmetic Industry
The cosmetics market of India is expected to triple by 2025. Wikimedia Commons

Do you know why many different chemical compounds found in creams, cosmetics, and other topical consumer products trigger allergic reactions in the skin? The way some chemicals displace natural fat-like molecules — called lipids — in skin cells may be the culprit, suggests new research.

This discovery, published in the journal Science Immunology, raises the possibility that allergic contact dermatitis could be stopped by applying competing lipids to the skin to displace those triggering the immune reaction.

Currently, the only way to stop allergic contact dermatitis is to identify and avoid contact with the offending chemical. Topical ointments can help sooth the rashes, which usually clear up in less than a month.

In severe cases, physicians may prescribe oral corticosteroids, anti-inflammatory agents that suppress the immune system, increasing the risk of infections and other side effects.

An allergic reaction begins when the immune system’s T cells recognise a chemical as foreign. T cells do not directly recognise small chemicals, and research suggests that these compounds need to undergo a chemical reaction with larger proteins in order to make themselves visible to T cells.

“However, many small compounds in skincare products that trigger allergic contact dermatitis lack the chemical groups needed for this reaction to occur,” said study co-leader Annemieke de Jong, Assistant Professor of dermatology at Columbia University Vagelos College of Physicians and Surgeons in New York.

Every year, the sale of fairness creams keeps growing because of women's obsession with white skin
Cosmetics make a thriving business. Pixabay

“These small chemicals should be invisible to T cells, but they’re not,” De Jong said.

De Jong and her colleagues suspected that CD1a, a molecule that is abundant on Langerhans cells (immune cells in the skin’s outer layer), might be responsible for making these chemicals visible to T cells.

In the current study, conducted with human cells in tissue culture, the researchers found that several common chemicals known to trigger allergic contact dermatitis were able to bind to CD1a molecules on the surface of Langerhans cells and activate T cells.

Also Read: Xiaomi, Huawei to Use Samsung’s Foldable Panels

These chemicals included Balsam of Peru and farnesol, which are found in many personal care products, such as skin creams, toothpaste, and fragrances.

Within Balsam of Peru, the researchers identified benzyl benzoate and benzyl cinnamate as the chemicals responsible for the reaction, and overall they identified more than a dozen small chemicals that activated T cells through CD1a. (IANS)

Next Story

Here are Ways to Hide Stretch Marks with Makeup

How to cover stretch marks with makeup

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Makeup
The right makeup products can be used to cover stretch marks temporarily. Lifetime Stock

Stretch marks may be a fact of life, and while they’re certainly nothing to be ashamed of, there may be times where you’d like your stretch marks to be out of sight.

Whether there’s a special occasion you’re getting all dolled up for or you simply want to feel your most confident on the beach, the right makeup products can be used to cover stretch marks temporarily. Inputs from L’oreal Paris USA.

Colour correct

Using the colour wheel you learned about back in elementary school, you can easily neutralise any unwanted tones on your hair or skin. When it comes to covering stretch marks, it’s important to consider their tone. If they’re new and purplish, you’ll want to use a yellow colour corrector to cancel out the color of the stretch marks.

If your stretch marks are older, you may not need to colour correct them as they’re likely already flesh-toned, albeit lighter than the rest of your skin.

Makeup
After expertly covering your stretch marks, you wouldn’t want your makeup to budge throughout the day, so you need to set your makeup. Lifetime Stock

Use full-coverage foundation

Of course, a full-coverage foundation is essential for covering stretch marks. Choose a full-coverage formula that contains high-load pigments and can cover everything from scars to hyperpigmentation.

Set your makeup

After expertly covering your stretch marks, you wouldn’t want your makeup to budge throughout the day. To keep everything in place and get an extra boost of coverage, use a fluffy powder brush to sweep on a setting powder.

Also Read- What is the Potential of Virtual Reality in the Workplace?

Apply self-tanner

While not makeup, self-tanner is a holy grail beauty product that can help disguise the look of stretch marks. Not to mention, you’ll get the appearance of beautifully bronzed skin in the process. (IANS)