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Skin Problems & Treatments Health Center

Skin Changes - Topic Overview

Most skin bumps, spots, growths, and moles are harmless. Colored skin spots, also called pigmented lesions (such as freckles, moles, or flesh-colored skin spots), or growths (such as warts or skin tags) may be present at birth or develop as the skin ages.

Most skin spots on babies will go away without treatment within a few months. Birthmarks are colored marks on the skin that are present at birth or develop shortly after birth. They can be many different sizes, shapes, and colors, including brown, tan, black, blue, pink, white, red, or purple. Some birthmarks appear on the surface of the skin, some are raised above the surface of the skin, and some occur under the skin. Most birthmarks are harmless and do not need treatment. Many birthmarks change, grow, shrink, or disappear. There are many types of birthmarks, and some are more common than others. For more information, see the topic Birthmarks.

Acne is a common skin change that occurs during the teen years and may last into adulthood. Acne may be mild, with just a few blackheads (comedones), or severe, with large and painful pimples deep under the skin (cystic lesions). It may be present on the chest and back as well as on the face and neck. Boys often have more severe outbreaks of acne than girls. Many girls have acne before their periods that occurs because of changes in hormone levels. For more information, see the topic Acne.

During pregnancy, dark patches may develop on a woman's face. This is known as the "mask of pregnancy," or chloasma, and it usually fades after delivery. The cause of chloasma is not fully understood, although experts think that increased levels of pregnancy hormones cause the pigment-producing cells in the skin (melanocytes) to produce more pigment. You can reduce skin pigment changes during pregnancy by using sunscreen and staying out of the sun.

Actinic keratosis and actinic lentigines are types of colored skin spots that are caused by too much sun exposure. Although these spots are not skin cancers, they may mean that you have an increased chance of getting skin cancer, such as squamous cell skin cancer or a type of melanoma.

You may have an allergic reaction to a medicine that causes a skin change, or you may develop a skin reaction when you are out in the sun while you are taking a medicine (this is called photosensitivity). Rashes, hives, and itching may develop, and in some cases may spread to areas of your skin that were not exposed to the sun (photoallergy). For more information, see the topic Allergic Reaction.

Skin changes can also be caused by:

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WebMD Medical Reference from Healthwise

Last Updated: December 27, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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