Why some creams and cosmetics lead to skin rashes
Several different chemical compounds found in creams and cosmetics can cause allergic reactions on the skin, but how the reaction gets triggered has been a mystery. However, now a study has suggested possible reasons why some chemicals trigger dermatitis.
The researchers explained the way some chemicals displace natural fat-like molecules ( called lipids) in skin cells.
Poison ivy is a common known trigger for allergic contact dermatitis, an itchy skin rash. But many ingredients found in non-prescription topical products can trigger a similar type of rash.
An allerrgic 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, says a researcher.
These small chemicals should be invisible to T cells, but they're not, he added.
The research team suspects a molecule- CD1a, which 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, 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.
These chemicals included Balsam of Peru and farnesol, which are found in many personal care products, such as skin creams, toothpaste and fragrances.
Our work shows how these chemicals can activate T cells in tissue culture, but we have to eb cautious about claiming that this is definitively how it works in allergic patients, he said.
He further stated, the study does pave the way for follow-up studies to confirm he mechanism in allergic patients and design inhibitors of the response.
The only solution that is currently found to stop allergic contact dermatitis is to identify and avoid contact with the offending chemical. If prone to rashes, topical ointments can help soothe the rashes, which usually clears 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.
The researchers explained the way some chemicals displace natural fat-like molecules ( called lipids) in skin cells.
Poison ivy is a common known trigger for allergic contact dermatitis, an itchy skin rash. But many ingredients found in non-prescription topical products can trigger a similar type of rash.
An allerrgic 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, says a researcher.
These small chemicals should be invisible to T cells, but they're not, he added.
The research team suspects a molecule- CD1a, which 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, 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.
These chemicals included Balsam of Peru and farnesol, which are found in many personal care products, such as skin creams, toothpaste and fragrances.
Our work shows how these chemicals can activate T cells in tissue culture, but we have to eb cautious about claiming that this is definitively how it works in allergic patients, he said.
He further stated, the study does pave the way for follow-up studies to confirm he mechanism in allergic patients and design inhibitors of the response.
The only solution that is currently found to stop allergic contact dermatitis is to identify and avoid contact with the offending chemical. If prone to rashes, topical ointments can help soothe the rashes, which usually clears 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.