Evidence
What the evidence shows
People don't "catch" melasma; they "get" it through a specific confluence of risk factors. Understanding how you get it is the first step in learning how to prevent and treat it.
Are you a woman between 20 and 50?
This is the highest-risk demographic.Do you have a parent or sibling with melasma?
Genetics play a significant role in how you get it.Are you pregnant or on birth control?
Hormones are a key factor in melasma development.Do you spend time in the sun without SPF?
UV exposure is the primary trigger.
Use this section to decide
Does this advice apply to me?
Find the concern or goal closest to yours, then use the fit signal to decide how much weight to give this guide.If your goal is
Factor 1Depends- Fit signal
- Possible fit
UV Exposure
If your goal is
Factor 2Depends- Fit signal
- Possible fit
Hormonal Changes
If your goal is
Factor 3Use caution- Fit signal
- Limited evidence
Genetics
If your goal is
The CombinationUse caution- Fit signal
- Limited evidence
Melasma
Research notes already in this guide
- The condition's high prevalence in pregnant women is one of the strongest pieces of evidence for the hormonal pathway.
- Melasma is much more common in occupations with high sun exposure, supporting the UV pathway.
- First-degree relatives of melasma patients have a significantly higher risk, confirming the genetic component.
- The combined factors explain why it's a chronic and often recurrent condition.
Practical use
How to use it
Know Your Risk
Assess your personal risk factors: Are you a woman? Do you have a family history? Do you spend time in the sun? Understanding how you might get it helps you prevent it.
Protect Against UV
Since UV is the primary way people get melasma, daily, rigorous sun protection is the single most effective preventative measure.
Manage Your Hormones (If Possible)
If you are on a hormonal medication and are getting melasma, discuss alternatives with your doctor.
Safety
Side effects and cautions
- Thinking you "caught" it from someone or something
Melasma is not contagious. You get it through a biological response to triggers, not through infection.
- Believing it's a sign of bad health
Getting melasma is not a sign that you're unhealthy. It's a sign that your skin has a specific reactivity to triggers.
- Assuming it only happens in the summer
You can get melasma year-round if the triggers (especially UV) are present, even through clouds or windows.
Worth noting
Small details that can change the answer
- It's Acquired, Not Inherited. You don't get melasma at birth. You acquire it through life experiences.
- Women Get It More. Women get melasma far more often than men, primarily because of hormonal fluctuations.
- Sun Exposure is the Most Common Trigger. The most common way people get melasma is through UV exposure, often combined with other factors.
- It Can Be Triggered by Medications. Some medications, particularly those that cause photosensitivity, can also be a route to getting melasma.
You get melasma through a combination of UV, hormones, and genetics.
UV radiation is the primary trigger and the most common route.
Hormonal changes, such as pregnancy or birth control, are a major factor for women.
A family history of melasma is a significant risk factor.
Understanding how you get it is the foundation for an effective prevention and treatment plan.
Definition
The Pathways to Getting Melasma
Melasma is an acquired condition that is typically caused by a combination of factors. The three primary pathways are: UV radiation, which acts as the primary trigger; hormones, which amplify the skin's response; and genetics, which determine an individual's baseline susceptibility. You get melasma when these pathways overlap.
Explanation
The Most Common Ways You Get It
The vast majority of people who get melasma do so through a combination of these factors. The most common scenario is a woman in her childbearing years who is using hormonal contraception and experiences regular sun exposure. Another typical route is a pregnancy, where the massive surge in hormones makes the skin hyper-reactive to even mild UV exposure. Men rarely get melasma through hormones alone; their path is more often through cumulative UV damage combined with a family history.
Risks
The Risk Factors: How You Get It
Certain risk factors increase the likelihood of you getting melasma.
- Being a woman, particularly during your reproductive years.
- Having a family history of melasma.
- Using hormonal contraceptives or hormone replacement therapy.
- Having a history of significant or chronic sun exposure.
- Having a skin type that tans easily (Fitzpatrick III-VI).
Questions
Frequently asked questions
Can you get melasma from stress?
Stress can influence hormones, which can then make you more likely to get melasma, but it's not a direct cause.
Can you get melasma from your phone or computer?
The blue light (HEV) emitted by screens may be a factor, especially for those with a predisposition, but UV light from the sun is the primary way people get it.
Can you get melasma from heat?
Heat is not a primary cause, but it can make it worse in some people.
Can you get melasma at any age?
It's most common in the reproductive years, but you can get it at any age, particularly with accumulated UV exposure.
References
Sources
The notes below are drawn from the evidence already cited in this guide. They are not a complete bibliography.
- The condition's high prevalence in pregnant women is one of the strongest pieces of evidence for the hormonal pathway.
- Melasma is much more common in occupations with high sun exposure, supporting the UV pathway.
- First-degree relatives of melasma patients have a significantly higher risk, confirming the genetic component.
- The combined factors explain why it's a chronic and often recurrent condition.