They don't work on melasma, which many people naturally assume is the same thing.
From the guardian.co.uk
In addition, she found that clearance of melasma was maintained for at least six months.
From the sciencedaily.com
For instance, melasma is a skin condition in which sun damage causes areas of brown discoloration.
From the blog.beliefnet.com
So far, we have been able to control melasma more effectively and extend the remission periods.
From the sciencedaily.com
Patients who have melasma, need to be especially careful of the sun and wear broad spectrum sunscreen.
From the usatoday.com
I developed a patch of brown melasma across my forehead while pregnant, and find treatments limited and ineffective.
From the guardian.co.uk
What they need to realize is there are other conditions that can be exacerbated by the sun, such as melasma.
From the usatoday.com
I recommend 45 or 50 for my patients with melasma.
From the usatoday.com
Anyways does oestrogen increase melasma in women?
From the newscientist.com
More examples
Chloasma: a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives
Melasma (also known as "Chloasma faciei"James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0721629210. or the mask of pregnancy when present in pregnant women) is a tan or dark skin discoloration. ...
Dark, brown, symmetrical patches of pigment on the face.
A condition in which pigmentation of the cheeks of the face darkens into tan or brown patches. This condition occurs in half of all women during pregnancy.
A tan or dark facial skin discoloration. Although it can affect anyone, melasma is particularly common in women, especially pregnant women and those who are taking oral contraceptives or hormone replacement therapy (HRT) medications. ...
A light tan to dark brown pigmentation of the face (cheek, forehead) in a mask like configuration. It is commonly seen in pregnant women or those taking birth control pills. The pigment lies at a deeper level than the depth reached by pigment lasers. ...
Large, amorphous, dark discolorations on the skin.
Discolored, dark, irregular patches of skin on the face, most commonly in women and pregnant women.
A hormonal form of pigmentation, usually occuring as brown patches on the cheeks, upper lip and forehead.