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Skin color - patchy
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Skin color - patchy

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Dyschromia; Mottling

Patchy skin color is areas where the skin color is irregular. Mottling or mottled skin refers to blood vessel changes in the skin that cause a patchy appearance.

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  • Considerations

    Irregular or patchy discoloration of the skin can be caused by:

    • Changes in melanin, a substance produced in the skin cells that gives skin its color
    • Growth of bacteria or other organisms on the skin
    • Blood vessel (vascular) changes

    The following can increase or decrease melanin production:

    • Your genes
    • Heat
    • Injury
    • Exposure to radiation (such as from the sun)
    • Exposure to heavy metals
    • Changes in hormone levels

    Exposure to sun or ultraviolet (UV) light, especially after taking a medicine called psoralens, may increase skin color (pigmentation). Increased pigment production is called hyperpigmentation.

    Decreased pigment production is called hypopigmentation.

    Skin color changes can be their own condition, or they may be caused by other medical conditions or disorders.

    How much skin pigmentation you have can help determine which skin diseases you may be more likely to develop. For example, lighter-skinned people are more sensitive to sun exposure and damage, which raises the risk of skin cancers. But even in darker-skinned people, too much sun exposure can lead to skin cancers.

    Examples of skin cancers are basal cell carcinoma and melanoma.

    Generally, skin color changes are cosmetic and do not affect physical health. However, mental stress can occur because of pigment changes. Some pigment changes may be a sign that you are at risk of other medical disorders.

  • Causes

    Causes of pigment changes may include any of the following:

    • Café-au-lait spots
    • Chloasma
    • Cuts, scrapes, wounds, insect bites and minor skin infections
    • Erythrasma
    • Melasma
    • Melanoma
    • Moles (nevi), bathing trunk nevi, or giant nevi
    • Mongolian blue spots
    • Pityriasis alba
    • Radiation therapy
    • Rashes
    • Sensitivity to the sun due to medication reactions or certain drugs
    • Sunburn or suntan
    • Tinea versicolor
    • Unevenly applying sunscreen, leading to areas of burn, tan, and no tan
    • Vitiligo
  • Home Care

    In some cases, normal skin color may return on its own.

    You may use lotions that bleach or lighten the skin to reduce discoloration or to even the skin tone where hypopigmented areas are large or very noticeable. Follow the instructions on the package about how to use such products.

    Selenium sulfide (Selsun Blue), ketoconazole, or tolnaftate (Tinactin) lotion can help treat tinea versicolor. Apply as directed to the affected area daily until the discolored patches disappear. Tinea versicolor often returns, even with treatment.

    You may use cosmetics or skin dyes to hide skin color changes. Makeup can also help hide mottled skin, but it will not cure the problem.

    Avoid too much sun exposure and use sunblock with an SPF of at least 30. Hypopigmented skin sunburns easily, and hyperpigmented skin may get even darker. In darker-skinned people, skin damage may cause permanent hyperpigmentation.

  • When to Contact a Medical Professional

    Contact your doctor if:

    • You have any lasting skin color changes that do not have a known cause
    • You notice a new mole or other growth
    • An existing growth has changed color, size, or appearance
  • What to Expect at Your Office Visit

    The doctor will carefully examine your skin and ask about your medical history. You will also be asked about your skin symptoms, such as when you first noticed your skin color change, it if started suddenly, and if you had any skin injuries.

    Tests that may be done include:

    • Scrapings of skin lesions
    • Skin biopsy
    • Wood's lamp (ultraviolet light) examination of the skin

    Treatment will depend on the diagnosis of your skin problem.

Related Information

  MelaninSkin - abnormally ...CancerBasal cell carcino...Squamous cell skin...Stress and anxiety...     Anxiety disorders...

References

Bolognia JL, Orlow SJ. Melanocyte biology. In: Bolognia JL, Jorizzo JL, Schaffer JV, eds. Dermatology. 3rd ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 65.

Yohn J. Disorders of pigmentation. In: Fitzpatrick JE, Morelli JG, eds. Dermatology Secrets Plus. 4th ed. Philadelphia, PA: Elsevier Mosby; 2010:chap 18.

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Review Date: 7/30/2014  

Reviewed By: Richard J. Moskowitz, MD, Dermatologist in private practice, Mineola, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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