Health Encyclopedia

Sporotrichosis

Definition

Sporotrichosis is a long-term (chronic) skin infection that is caused by a fungus called Sporothrix schenckii.

Causes

Sporothrix schenckii is found in plants. Infection commonly occurs when the skin is broken while handling plant material such as rosebushes, briars, or dirt that contains a lot of mulch.

Sporotrichosis can be a job-related disease for people who work with plants, such as farmers, horticulturists, rose gardeners, and plant nursery workers. Widespread (disseminated) sporotrichosis can develop in people with a weakened immune system when they inhale dust filled with spores of the fungus.

Symptoms

Symptoms include a small, painless, red lump that develops at the site of infection. As time passes, this lump will turn into an ulcer (sore). The lump may develop up to 3 months after an injury.

Most sores are on the hands and forearms because these areas are commonly injured when handling plants.

The fungus follows the channels in your body's lymph system. Small ulcers appear as lines on the skin as the infection moves up an arm or leg. These sores do not heal unless they are treated, and they may last for years. The ;sores may sometimes drain small amounts of pus.

Body-wide (systemic) sporotrichosis can cause lung and breathing problems, bone infection, arthritis, and infection of the nervous system.

Exams and Tests

The health care provider will examine you and ask about your symptoms. The examination will show the typical sores caused by the fungus. Sometimes, a small sample of affected tissue is removed, examined under a microscope, and tested in a lab to identify the fungus.

Treatment

The skin infection is often treated with an antifungal medicine called itraconazole. It is taken by mouth and continued for 2 to 4 weeks after the skin sores have cleared. You may have to take the medicine for 3 to 6 months. A medicine called terbinafine may be used instead of itraconazole.

Infections that have spread or affect the entire body are often treated with amphotericin B, or sometimes itraconazole. Therapy for systemic disease can last up to 12 months.

Outlook (Prognosis)

With treatment, full recovery is likely. Disseminated sporotrichosis is more difficult to treat and requires several months of therapy. Disseminated sporotrichosis can be life threatening for people with a weakened immune system.

Possible Complications

People with a healthy immune system may have:

Discomfort
Secondary skin infections (such as staph or strep)

People with a weakened immune system may develop:

Arthritis
Bone infection
Complications from medicines -- amphotericin B can have serious side effects, including kidney damage
Lung and breathing problems (such as pneumonia)
Brain infection (meningitis)
Widespread (disseminated) disease

When to Contact a Medical Professional

Make an appointment with your provider if you develop persistent skin lumps or skin ulcers that do not go away. Tell your provider if you know that you were exposed to plants from gardening.

Prevention

People with a weakened immune system should try to reduce risk for skin injury. Wearing thick gloves while gardening can help.

References

Kauffman CA, Galgiani JN, Thompson GR. Endemic mycoses. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 316.

Rex JH, Okhuysen PC. Sporothrix schenckii. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 259.

Review Date:3/10/2022
Reviewed By:Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, 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.

The Agency for Health Care Administration (Agency) and this website do not claim the information on, or referred to by, this site is error free. This site may include links to websites of other government agencies or private groups. Our Agency and this website do not control such sites and are not responsible for their content. Reference to or links to any other group, product, service, or information does not mean our Agency or this website approves of that group, product, service, or information.

Additionally, while health information provided through this website may be a valuable resource for the public, it is not designed to offer medical advice. Talk with your doctor about medical care questions you may have.