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The creams may contain corticosteroids or hydroquinone, which can be harmful if used in high quantities, and in many countries are only obtainable with a doctor's prescription.

Other sellers admitted using regulated ingredients such as kojic acid, hydroquinone and a powerful antioxidant, glutathione, which may cause rashes and other side-effects.

All the products in question contain hydroquinone.

The FDA says it has received reports of serious side effects from the use of products that contain hydroquinone, including rashes, facial swelling and skin discoloration that can be permanent.

Corey L. Hartman, a dermatologist in Birmingham, Ala., says using hydroquinone without a doctor’s supervision can have serious consequences, including permanent darkening of the skin.