July 9, 2025

What is the Main Cause of Melasma?

Melasma is a common skin condition that causes brown or grayish-brown patches to appear on the face—particularly the cheeks, forehead, nose, and upper lip.

It’s most prevalent among women and individuals with medium to dark skin tones. But what exactly causes melasma to develop?

Let’s explore the main triggers behind melasma, how they affect your skin, and what you can do to prevent this persistent pigmentation issue.

What Triggers Melasma?

Melasma develops due to the overproduction of melanin, the pigment responsible for your skin’s color.

This happens when melanocytes (pigment-producing cells) become hyperactive in certain areas of the skin. But what causes this hyperactivity?

1. Hormonal Changes: The Primary Driver

Hormonal fluctuations are one of the most common causes of melasma, especially in women. Changes in estrogen and progesterone levels can stimulate melanin production.

  • Pregnancy: Known as chloasma or the “mask of pregnancy,” melasma is often seen in expectant mothers due to high hormone levels.
  • Oral contraceptives: Birth control pills can mimic hormonal changes similar to pregnancy.
  • Hormone therapy: Treatments like estrogen replacement can also trigger melasma.

This is why dermatologists often see a spike in melasma cases among women in their reproductive years.

2. Sun Exposure and UV Radiation

Ultraviolet (UV) rays from sunlight are a major external trigger for melasma. Sun exposure can:

  • Activate melanocytes, leading to overproduction of melanin
  • Worsen existing melasma patches or cause new ones to form
  • Make treatment less effective if proper sun protection isn’t used

Even exposure to visible light and heat (infrared) can aggravate melasma, making daily sunscreen use essential.

3. Genetic Predisposition

Your genes may play a significant role in how likely you are to develop melasma.

  • Those with darker skin tones—such as individuals of Latin, Asian, Middle Eastern, or Mediterranean descent—are more susceptible.
  • If family members have melasma, your chances increase due to inherited melanocyte sensitivity.

4. Medications and Phototoxic Reactions

Some medications make the skin more sensitive to light, which can indirectly contribute to melasma.

  • Antiseizure medications
  • Phototoxic drugs (those that cause sun sensitivity)
  • Certain antibiotics or chemotherapy agents

These drugs can cause pigmentation as a side effect, especially when combined with sun exposure.

5. Stress and Cortisol Imbalance

Stress isn’t just bad for your mental health—it can also affect your skin.

  • Stress raises cortisol levels, a hormone that can stimulate melanin production.
  • Chronic stress may trigger or worsen melasma in predisposed individuals.

Is Melasma More Common in Women?

Yes. Women account for over 90% of melasma cases, largely due to hormonal factors. Birth control pills, pregnancy, and hormone therapies are the most frequent internal triggers.

While men can develop melasma, it’s significantly less common and usually linked to sun exposure or genetics rather than hormones.

Why Did I Suddenly Get Melasma?

Many people are surprised when melasma appears suddenly and without warning. Some possible explanations include:

  • A new birth control pill or hormonal medication
  • A recent vacation or extended sun exposure
  • Use of new skincare products that sensitize the skin
  • An underlying thyroid issue or other hormone imbalance

A combination of internal and external triggers is usually to blame.

How to Prevent Melasma from Getting Worse

While melasma can be persistent, taking the right steps can prevent it from worsening:

  • Use broad-spectrum sunscreen (SPF 30 or higher) every day—even indoors
  • Wear hats and sunglasses for extra UV protection
  • Avoid harsh skincare products that can irritate the skin
  • Manage hormone levels with the help of a medical professional
  • Reduce stress through mindfulness, exercise, or therapy

Treatment options may include topical creams, chemical peels, or laser therapy—but prevention is always the first step.

Conclusion

So, what is the main cause of melasma?

It’s a combination of hormonal changes and sun exposure, often intensified by genetic factors and lifestyle habits.

Understanding your personal risk and taking proactive steps—like sun protection and stress management—can help you keep melasma under control.

For expert diagnosis and personalized treatment, consult with a trusted professional like Dr. Hera Tabassum, dermatologist in Roorkee skin specialists in Roorkee, who offers advanced care for pigmentation disorders like melasma.

FAQs About Melasma Causes

Q: What foods cause melasma?
A: While no specific food directly causes melasma, foods that affect hormone levels (like soy or processed items with phytoestrogens) may influence it in some cases.

Q: Can melasma go away on its own?
A: Sometimes. Melasma related to pregnancy or medication may fade when the trigger is removed, but persistent cases usually require treatment.

Q: Is melasma curable?
A: Melasma is not always curable, but it is very manageable with consistent care, sun protection, and the right dermatological treatments.