Dark Spot and Skin-Lightening Creams: How to Spot Mercury Before It Harms You

Age spots, sun spots and uneven tone become more common after 50, and creams that promise to fade them are everywhere, including online marketplaces and social media. The FDA¹ warns that some of these creams, soaps and lotions contain mercury.¹

Where these products turn up

The FDA¹ says mercury-containing creams are usually marketed as skin lighteners or anti-aging treatments that remove age spots, freckles, blemishes and wrinkles. They’re usually made abroad and sold illegally in the U.S., promoted on social media and sold through apps, or brought back from trips.¹ The FDA doesn’t allow mercury in cosmetics or drugs except under narrow conditions these products don’t meet.¹

What can happen

• A whole household can be exposed. In a 2010 investigation in California and Virginia, unlabeled creams contained 2% to 5.7% mercury by weight. Of 22 people tested in five households, 15 had high mercury levels, including six who never used the cream.²
• Severe, lasting harm. In 2019, a 47-year-old California woman who had applied a cream from abroad to her face twice daily for 7 years developed arm weakness, blurry vision and trouble walking, then delirium. The cream contained a highly toxic form of mercury. Despite treatment, she was left unable to speak or care for herself.³

Family members can be exposed by breathing vapors or through shared washcloths and towels.¹

Signs of mercury poisoning

The FDA¹ lists irritability, shyness, tremors, changes in vision or hearing, memory problems, depression, and numbness or tingling in the hands, feet or around the mouth.¹

Label checklist

1. Read the ingredients. Stop using it right away if you see “mercurous chloride,” “calomel,” “mercuric,” “mercurio” or “mercury.”¹
2. No label, no use. Federal law requires ingredients on cosmetics and nonprescription drugs.¹
3. Be wary of labels only in another language with no English labeling.¹
4. Be skeptical of creams sold through social media or brought from abroad.¹
5. If you’ve used one, wash skin that touched it, call your clinician or Poison Control at 1-800-222-1222, and seal the product in a bag or leak-proof container before asking your local waste agency how to dispose of it.¹

Safer paths for dark spots

Daily sunscreen helps keep spots from darkening. A dermatologist can tell harmless age spots from changes that need a closer look and suggest proven treatments. Our guides to age spots, dark patches on the face and choosing sunscreen explain the options.

Try: “I’ve been using a cream a friend brought from overseas for my dark spots. Can you check whether it’s safe, and should I be tested for mercury?”

Skin, Head to Toe includes a short-shelf planner and a 12-week SkinLog. Use them to list every product you use, track spots with photos and dates, and bring both to your dermatology visit. See the book.