Tinea Nigra

Definition

Tinea nigra is an infection of the skin. It affects the outermost layer of skin. The infection will cause a black or brown patch on the skin. Except for the dark patch, tinea nigra is a harmless condition.Tinea nigra usually affect the palms of the hands or soles of the feet. It may also appear on the neck or trunk.
Cross-Section of Skin
skin layers cross section
Tinea nigra affects the topmost layer of skin.
Copyright © Nucleus Medical Media, Inc.

Causes

Tinea nigra is caused by a fungus. The type of fungus that causes this infection is most often found in rotting wood, soil, compost, or sewage. The fungus may enter your body through a break in your skin.

Risk Factors

You are more likely to develop tinea nigra if you have been living or traveling in tropical or subtropical areas, such as:
  • South Africa
  • Brazil
  • Panama
  • Cuba
  • Puerto Rico
  • Coastal areas along the southeastern United States

Symptoms

Tinea nigra causes a brownish-black patch on the skin that:
  • Has an irregular shape with a darker border
  • May be itchy or scaly
  • Tends to expand over time
A tinea nigra patch may be mistaken for a type of skin cancer. Talk to your doctor about any skin growth or changes.

Diagnosis

Your doctor will ask about your symptoms and medical history. A physical exam will be done. You may need to see a skin specialist for tests, diagnosis, and treatment.Tinea nigra is diagnosed by scraping a small sample of the affected skin. The sample is examined under a microscope.

Treatment

Tinea nigra is usually treated with an antifungal medication. The medication is placed on the skin as creams or ointments.

Advertisement

Prevention

To help reduce your chance of tinea nigra:
  • Use care when traveling in high-risk areas.
  • Avoid contact with potentially infected material, such as rotting wood, dirt, sewage, or compost.
  • If you must work with any of the materials listed above, take the proper safety steps. Wear gloves and other protective gear.

RESOURCES

American Academy of Dermatology
http://www.aad.org

Dr. Fungus
http://www.doctorfungus.org

CANADIAN RESOURCES

Health Canada
http://www.hc-sc.gc.ca

The College of Family Physicians of Canada
http://www.cfpc.ca

References

Gupta AK. Tinea corporis, tinea cruris, tinea nigra, and piedra. Dermatol Clin. 2003;21:395-400.

Habif TP. Clinical Dermatology. 4th ed. St. Louis: Mosby; 2004.

Mandel GL, Bennett JE, et al. (eds). Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, PA: Elsevier, Inc.; 2005.

Tropical travel. American Academy of Dermatology website. Available at: http://www.aad.org/media-resources/stats-and-facts/prevention-and-care/tropical-travel. Accessed December 7, 2012.

Revision Information

Did you like this? Share with your family and friends.
Current Research From Top Journals


Exercise During Pregnancy May Decrease the Risk of Cesarean Birth
December 2014

Exercise during pregnancy has been associated with many benefits for mom and baby. This review supports the trend and finds that even one day of purposeful activity per week may reduce the need for cesarean birth.

dot separator
previous editions

Maternal Caffeine Intake May Be Associated with Low Birth Weight
November 2014

Prevent Eczema in Kids with a Daily Dose of Moisturizer
November 2014

Broccoli Sprout Compound Associated with Reduction in Autism Symptoms
October 2014

dashed separator

Advertisement

Our Free Newsletter
click here to see all of our uplifting newsletters »

 

Advertisement

Advertisement

DiggDeliciousNewsvineRedditStumbleTechnoratiFacebook