Merck Manual

Please confirm that you are not located inside the Russian Federation

Yes No
Leave this Site?

The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.

Continue Cancel
honeypot link
Brought to you by
Merck Manual
Consumer Version
The trusted provider of medical information since 1899
VIEW PROFESSIONAL VERSION
VIEW PROFESSIONAL VERSION

Enter search terms to find related medical topics, multimedia and more.

Advanced Search:

  • Use “ “ for exact phrases.
    • For example: “pediatric abdominal pain”
  • Use – to remove results with certain keywords.
    • For example: abdominal pain -pediatric
  • Use OR to account for alternate keywords.
    • For example: teenager OR adolescent

Health Topics & Chapters
Melasma
m1301021-melasma-science-photo-library-high
Melasma

    In some pregnant women, a blotchy, brownish pigment (melasma, or mask of pregnancy) appears on the skin of the forehead and cheeks (as shown in this photo).

DR P. MARAZZI/SCIENCE PHOTO LIBRARY

In these topics
Quick Facts: Physical Changes in the Mother During Pregnancy Physical Changes During Pregnancy

Brought to you by Merck & Co, Inc., Rahway, NJ, USA (known as MSD outside the US and Canada)—dedicated to using leading-edge science to save and improve lives around the world. Learn more about the Merck Manuals and our commitment to Global Medical Knowledge.


Copyright © 2023 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.