lotions in store

Dermidia Select: A Web Tool for Selecting Eucerin® Lotions

Dermidia Select is a handy web-based tool. It guides you to the right Eucerin® lotion based on your skin needs and indoor conditions. Eucerin® lotions can treat dry skin and keep it hydrated all year round.

People choose a moisturizing body lotion for two main reasons. One is to stop skin from drying out, and the other is to heal dry skin. With so many lotions out there, picking the right one can be tricky.

Select Lotions for Prevention

As we get older, taking care of our skin becomes more important. This is because the skin’s protective layer changes and becomes less effective. Using moisturizers regularly can help keep skin hydrated. Changes in the weather can affect indoor conditions and dry out your skin. That’s why it’s important to adjust your skin-care routine as needed. Dermidia Select suggests lotions based on the current Dry Skin Index predicted for your area.

It uses a special model to predict indoor skin stresses. It links current weather conditions to the Dry Skin Index. This model is designed for detached, wood-frame houses in the USA. Therefore, the predictions might not match exactly with your housing situation.

dermidia-select: quickly find a eucerin lotion

Select Lotions for Healing

The longer skin is exposed to indoor dermal stresses, the greater the risk of feeling and observing dry-skin symptoms. If left untreated, skin can become flaky, rough, and even itchy.

For each skin condition listed below, the web app recommends a Eucerin® lotion that specifically targets the dry skin symptom of interest.

  • Dry skin
  • Very dry skin
  • Very dry, flaky skin
  • Extremely dry, rough skin

It may take several days to see improvement in your skin. For best results, apply lotions after you shower. Once you have restored your skin’s hydration, consider a daily prevention regimen using lotions based on the level of the Dry Skin Index.


Dermidia Select is a simple and convenient way to find the best Eucerin® lotion for your skin. Whether you want to prevent or heal dry skin, this web app can guide you to the right product based on your needs and indoor conditions. You can also buy the recommended lotions online through Amazon links. Try Dermidia Select today and see the difference in your skin!

Use the Skin Sim app to guide your seasonal skin care

The Skin Sim app simulates seasonal changes in drying stresses on skin at a reference house in your community. It uses an indoor air model along with historic climatic data from NASA to reconstruct these stresses.

The app presents predicts the Dry Skin Index, which is based on a thermodynamic property of water vapor. It is calculated from indoor temperature and humidity.

How can Skin Sim help you improve your skin care?

A motivating force behind Dermidia is the recognition that 1) as we age our skin becomes more susceptible to indoor drying stresses, and 2) these stresses change seasonally, but we can’t sense them directly. Therefore, we need tools to guide our skin-care practices over the course of a year.

One such tool we developed is the app Skin Sim, which is available from Google Play and iOS App Store.

The adjacent screen shot depicts the simulation results from the app for a location that has a large number of days in which the Dry Skin Index is above 5. Perhaps the biggest surprise is how the drying stresses increased rapidly in the early fall after the humid summer months. This is apt to be a time when people begin experiencing dry skin without necessarily knowing the cause.

Conversely, stresses begin to let up in late Spring, which means that your skin-care should change as well.

You can become more knowledgeable about the seasonal drying stresses impacting your skin care by using the Skin Sim app.

Skin Sim by Dermidia simulates the Dry Skin Index

Discover patterns of dermal drying stresses that matter to you. Prepare and respond accordingly!

Dave Layton, Owner, Dermalapps LLC

Action items

It is quite easy to use the Skin Sim app–download from one of the app stores and type in your location.

  • Pay particular attention to the number of days above DSI levels of 5 and 6, as these elevated levels increase the risk of dry skin formation.
  • Identify times of year in which the Dry Skin Index is rapidly increasing or decreasing.
  • Consider how to compensate for these changing stresses by applying moisturizing lotions/creams to areas of skin prone to dryness.
  • Don’t forget about room humidifiers as another way to reduce drying stresses when indoor humidities are low.
A humidifier supports better skin care

Use a humidifier to fight winter dry skin!

Millions of people use humidifiers to combat seasonal dry air and its impact on skin (e.g., “winter dry skin”). However, it may not always be clear how well they work and whether they really can support better skin care. These are important concerns, so I decided to conduct a simple test using a small room humidifier in my home office.

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Consider moisturizers with ceramides for aging skin

Healthy, hydrated skin does not show signs of dryness such as dry spots or skin flakes. Skin hydration depends on the barrier function of the skin’s outer layer (stratum corneum). Lipids (fats) in this outer layer help control the loss of water from the skin. Ceramides are a key component of skin lipids. They are also used as an active ingredient in various moisturizing lotions and creams.

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Home office

How working at home supports your skin care

Efforts to control the Covid-19 epidemic included lockdowns that forced millions of people to work at home in addition to those previously doing so. If you are now working from home, then you have probably already considered the many pros and cons of this arrangement. One of the “collateral” benefits you might not have considered is that working at home can actually support better skin care! Although this assertion may not seem obvious, there are at least 4 reasons why you should enjoy healthier skin at home, as compared to working elsewhere:

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When should you turn on a humidifier to hydrate your skin?

Each year people in the USA conduct Internet searches for the term “humidifier”. These searches are seasonal in nature and coincide with the drying trends in the weather that impact indoor air. Internet searches for “humidifier” are also seasonally correlated with searches for “dry skin”, which makes sense because people use humidifiers to deal with dry skin and other conditions related to dry indoor air.

Depending on your situation, you can decide to turn on your humidifier when:

  1.  you start experiencing dry skin,
  2. the indoor heating season starts in early fall,
  3. the relative humidity is below a target range of 40 to 60%, or
  4. the Dry Skin Index exceeds 6.

Humidifier use trigger: dry-skin symptoms

One option for deciding when to set up your room or portable humidifier is the condition of your skin. Specifically, does your skin exhibit drying symptoms such as dandruff, flakes, itchiness, or roughness? As a first course of action, it may actually be easier to apply a skin moisturizer to dry areas of your skin instead of running a humidifier. However, as indoor air gradually becomes drier into the fall, moisturizer therapy alone may not completely alleviate your symptoms. In this situation, consider using a humidifier in your bedroom when you sleep. This is a reasonable “first-use” of a humidifier. Nevertheless, if dry-skin conditions persist, a room humidifier together with the selective application of moisturizing lotions and creams constitutes a flexible treatment strategy.

Humidifier use trigger: start of heating season

If you don’t want to wait for dry-skin symptoms to develop before using a humidifier, then an easy-to-remember trigger is the start of the heating season. The cooler outdoor air that prompts the use of indoor heating also contains lower levels of water vapor. As the cool, dry air enters a warmer residence the relative humidity drops because the warm air can hold a lot more water vapor. Lower indoor temperatures and humidities put increased drying stresses on skin–causing seasonal dry skin.

For many parts of the USA, October marks the beginning of the heating season, which makes it a good month to get your humidifier ready and to check whether you have moisturizers ready for use too.

Humidifier use trigger: target relative humidity

Research has shown that the optimum relative humidity for healthy skin is about 60%. As the relative humidity decreases below that level, your skin begins to dehydrate, and therefore the need for remedial rehydration measures increases, including the application of moisturizers to impacted skin and/or the operation of a room humidifier.

There is no standard “trigger” level of relative humidity for starting up a humidifier, but 40% RH seems to be a good default level–and here’s why. Relative humidities just below 60% are probably best handled by simply applying a moisturizer to the areas of your skin that are prone to dryness. Below 40% RH, the extra hydration provided by a humidifier can help ameliorate the external drying stresses over your entire skin surface.

Humidifier use trigger: Dry Skin Index above 6

An alternative “trigger” is to consider a room humidifier when the Dry Skin Index (DSI) exceeds a value of 6. The risk of dry-skin formation generally starts when the DSI level is between 4 and 5, depending on how a person’s skin responds to drying stresses. Also, older people are likely to be more susceptible to dry skin formation due to biochemical changes in the skin’s barrier function with age. At moderate levels of the DSI, skin moisturizers are usually the most convenient way of keeping skin hydrated, but at high levels (DSI 6 +), a room humidifier becomes a useful tool in keeping your skin hydrated. If you work from home, you have more flexibility to use a humidifier in selected rooms that you use.

Humidifier triggers: some pros and cons

The “best” trigger for you is the one that is most likely to get you to start up a humidifier! Perhaps the most “persuasive” trigger is the development of dry-skin symptoms. However, waiting for symptoms to occur delays the timely treatment of skin dehydration.

Alternatively, the start of the heating season can serve as a reminder that the time is at hand to start up a humidifier—prior to the manifestation of dry-skin symptoms. If that trigger proves problematic (will you really remember to get the humidifier out?), then monitoring indoor relative humidity constitutes another option. Nevertheless, one pitfall here is that inexpensive humidity sensors can give inaccurate readings of relative humidity, which means that you could be basing your skin-care decisions on erroneous information.

Ultimately, your awareness of the relationship between seasonal drying stresses on your skin and effective treatment options–including a room humidifier, constitutes the best motivational “trigger” for pursuing timely skin care.

Treat dry skin to reduce proinflammatory cytokines contributing to age-related diseases

Keeping your skin hydrated as you age is necessary to maintain your skin’s barrier function and inhibit the formation of dry skin. Research now indicates that a collateral benefit of hydrating skin care is a reduction in proinflammatory cytokines circulating in blood. These agents in blood plasma have been associated with inflammaging, which is low level, subclinical inflammation prevalent in aging populations.

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Let October Be Your Skin Care Preparedness Month!

The month of October for most of the United States marks the transition between the warm, humid, part of the year and the cooler months. Cooler weather produces higher indoor drying stresses on skin due to lower indoor humidities and temperatures. Now is a good time to evaluate your skin-care practices before dry, itchy skin develops!

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