The bulk of dust in your house is dead skin from the people who live in it. The skin is continually renewing itself from below and part of this process is the shedding of dead cells. This creates a lot of dusting. As always seems to be the case with the skin, it is fascinating to look into the details of the process. The bottom layer of the skin is the junction of the dermis with the epidermis. Cells from the dermis migrate upwards, losing their fluids and becoming more squashed as they get nearer to the surface.
When they get to the top layer, the stratum corneum, they have become flattened and dried out and are now composed mainly of protein. They are now known as corneocytes. I can remember being taught that corneocytes simply fell off. Once they corneocytes have got to this stage they are basically dry protein powder and are known as squames. The process by which they are lost is known as desquamation.
It is now known that this desquamation process is controlled by enzymes. The main enzyme involved is one of my favourites. It is called stratum corneum chymotryptic enzyme, or SCCE for short. The corneocytes are held together by tiny strands of protein called desomosomes. The role of SCCE is to snip these strands allowing the corneoctyes to desquame.
Enzymes have some common characteristics. They tend to work well when there is plenty of water about, and they have an optimum temperature and pH. There are a lot of biochemical processes going on in the skin, and our fried SCCE is just one of them, but nonetheless a crucial one. The rate at which skin cells are lost, which is under the control of SCCE, is a pretty key one to keeping the skin in tip top condition.
Which brings us to exfoliation. A lot of people use scrubs to remove the top layer of their skin and reveal the younger looking skin beneath. That is the theory at any rate, and a lot of people regard this as part of their regular regime to keep their skin looking good.
Is this right? I think this is probably something that varies from person to person. Your skin might well benefit from giving the desquamation process a bit of a boost by using a scrub or a chemical exfoliant. But I can easily imagine that if everything is already running smoothly, then this kind of intervention is not going to do much good and might even do some harm.
What I am sure about is that this is a process that you can definitely overdo. Taking off a few layers of squames a bit faster than they were going of their own accord is one thing. Stripping off large quantities of your skin’s top layers is quite another. The top layer of the skin is the bit that holds the moisture in the skin. Without it the skin rapidly dries out. This barrier is about half the thickness of a sheet of photocopy paper. When working on the development of skin scrubs I have from time to time overdone testing them out on myself as I go along. I don’t notice the effect at first. But my skin rapidly becomes dull in appearance and very itchy. This might well take a day or two to develop.
So my tip would be if you are using an exfoliating product don’t make it a daily routine. Once a week is probably a better idea. If you don’t see any benefit, then I wouldn’t carry on using it. When you try a new one don’t decide whether or not to continue using it until you have given it some time to make sure it isn’t actually making your skin worse.
But as I say, we are all different. If your skin is the type that needs a bit of help with the natural desquamation process, a good scrub might be a great product to add to your skincare toolkit.