Picture it: You’re the body’s military commander, and you’re reviewing your protective forces. Immune system? Check. Stomach acid? Check. Beneficial gut bacteria? Check.
Don’t forget to include your skin: it’s one of the most important bastions in the fight against disease, keeping harmful organisms and substances from getting inside the body.
Unfortunately, our skin weakens as we get older, and it requires more effort to keep it healthy. That job can take a back seat if you’re busy tending to other health issues or you’re unsure of how to care for your skin.
With infection on everyone’s mind, it’s time to refocus attention on the skin and strengthen your defenses.
The skin consists of three layers:
- The deepest layer (subcutaneous tissue) is made of connective tissue and fat, and provides insulation, energy storage, and shock absorption.
- The next layer (the dermis) contains collagen and elastin, blood vessels, nerves, sweat and oil glands, and hair follicles.
- The topmost layer (the epidermis) is built to be a barrier. It consists of five different layers of its own, each with cells constantly rising to the top part of the epidermis, called the stratum corneum — the skin we can see and a major part of the body’s defenses.
Within the stratum corneum are up to 30 layers of flat, dead, protein-filled cells that mix with fat and water to create a sort of brick-and-mortar matrix. It keeps moisture in the body and protects us from toxins, ultraviolet rays, and bacteria.
A number of factors can weaken the stratum corneum. One is aging. “The skin gets thinner, and the cells get flatter. Older skin has a lower water content. Fat diminishes and shifts, so everything is less vigorous and strong, particularly in areas of sun exposure,” explains Dr. Kenneth Arndt, a dermatologist and a prior medical editor of the Harvard Special Health Report Skin Care and Repair.
Dr. Arndt says heavy use of certain medications — such as topical, oral, or inhaled steroids — can also thin the skin. Inflammatory skin disorders, such as eczema (atopic dermatitis), can reduce the amount of fat in the stratum corneum, weakening the skin barrier.
And frequent hand washing or exposure to cleaning solvents or alcohol found in hand sanitizers can dry out and damage the skin surface. “The skin gets dry because soap can wash away fats in the skin,” Dr. Arndt says.
In other words, what we need to do to protect our health in the COVID-19 pandemic simultaneously threatens the health of the skin of our hands.
Dry, thin skin is more permeable than plump, healthy skin, and it can crack or tear easily, like tissue paper. “Any time the skin splits or is excessively dry, that’s an avenue for an organism to get in and cause problems,” Dr. Arndt notes. He says the coronavirus that causes COVID-19 is not contracted through the skin. But other types of bacteria can make us sick if they breach the skin barrier, such as Staphylococcus aureus or Streptococcus pyogenes.
These bugs may cause a type of infection called cellulitis in the skin tissue. Left untreated, the infection can spread to other parts of the body, causing fever or swelling, and increasing the risk for sepsis and hospitalization. Fighting back requires powerful antibiotics.
Rally the troops
Before you find yourself in the midst of battle, try fortifying your defenses. Dr. Arndt says the best way is to lock in moisture. “When you add moisture, the skin gets fatter and more flexible,” he says. “The trick is keeping it that way.”
He recommends moisturizing your skin right after you’ve bathed or washed your hands (which adds water to your skin). “Petroleum jelly is excellent at sealing in water, but it’s aesthetically not pleasing,” Dr. Arndt points out. “Creams contain water, oil, and emulsifiers to keep the ingredients mixed together, for ease of use. But things that aren’t greasy don’t work as well or for as long.”