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Overview

What Is Lobomycosis?

Lobomycosis is a rare, chronic fungal infection of the skin and underlying tissue caused by Lacazia loboi. It often affects exposed areas of the body after contact with an environmental source. Lobomycosis is not generally spread from person to person and is most often reported in tropical regions. People who work in rainforests or spend substantial time outdoors may have a higher risk of exposure.

Symptoms

Symptoms of Lobomycosis

Lobomycosis lesions usually develop slowly and may remain limited to one area for a long time. Their appearance and symptoms can vary depending on where they occur and how long they have been present. Some people notice little discomfort, while others develop itching, tenderness, or changes in sensation.

  • Firm, raised skin bumps or nodules
  • Smooth or shiny plaques
  • Clustered or spreading lesions
  • Itching
  • Tenderness or pain
  • Reduced sensation
  • Ulceration or a secondary infection in advanced or injured lesions

Causes

Causes of Lobomycosis

Lobomycosis is caused by Lacazia loboi, a fungus associated with soil, vegetation, and aquatic environments in endemic regions. The organism is believed to enter through small breaks in the skin after environmental contact, such as a minor cut or injury. However, Lacazia loboi has not been reliably cultured, so its precise environmental source and route of acquisition are not fully established.

Risk Factors

Risk Factors for Lobomycosis

  • Living in or traveling to an endemic tropical or subtropical region
  • Working in rainforest, agricultural, forestry, fishing, or other outdoor settings
  • Frequent contact with soil, vegetation, or natural bodies of water
  • Repeated minor skin injuries or insect bites
  • Prolonged occupational exposure without protective clothing
  • Previously having lobomycosis or persistent lesions after environmental exposure

Geography and many occupational exposures are not easily changed, while protective clothing, prompt wound care, and reducing unnecessary contact with environmental sources may be modifiable. These factors can increase exposure risk, but not everyone who works outdoors or visits a tropical region will develop lobomycosis.

Complications

Complications of Lobomycosis

  • Extensive enlargement or spread of lesions
  • Scarring or permanent changes in skin texture
  • Restricted movement when lesions involve joints or nearby tissue
  • Recurrent breakdown or ulceration
  • Bacterial infection of damaged skin
  • Emotional or social distress related to visible lesions

Complications of lobomycosis are usually local and develop gradually. Persistent or changing lesions should be assessed by a medical professional to confirm the diagnosis and rule out other infections or skin cancers.

Diagnosis

Diagnosis of Lobomycosis

Diagnosis begins with a skin examination and questions about geography, occupation, outdoor exposure, how long the lesion has been present, and any previous injury. The appearance of lobomycosis can resemble other chronic skin infections or tumors, so clinical findings alone may not be enough.

  • Skin biopsy or scraping for microscopic examination of characteristic yeast-like cells
  • Special stains to help identify the organism
  • Culture testing, although Lacazia loboi is difficult or unable to be routinely cultured
  • Molecular testing or specialist laboratory review when the diagnosis is uncertain

Treatment & Management

Treatment and Management of Lobomycosis

Treatment should be directed by a dermatologist or infectious-disease specialist because evidence is limited and the organism is difficult to culture. The treatment plan depends on the number, size, location, and depth of the lesions, as well as whether complete removal is practical.

  • Complete surgical excision may be used for selected localized lesions.
  • Antifungal medicines such as itraconazole or another specialist-selected regimen may be considered when surgery is unsuitable or disease is extensive.
  • Reconstructive treatment or wound care may be needed when tissue damage is substantial.
  • Long-term follow-up is important because lesions can recur after treatment.

Prevention

Preventing Lobomycosis

  • Wear boots, long trousers, gloves, and protective clothing in forest or agricultural settings.
  • Cover cuts and abrasions promptly.
  • Clean the skin after outdoor work.
  • Avoid unnecessary contact with potentially contaminated soil, vegetation, or water.
  • Seek evaluation for a persistent or slowly enlarging lesion after tropical outdoor exposure.

No vaccine or routine screening test is available for lobomycosis. Prevention focuses on reducing skin exposure, protecting minor wounds, and recognizing persistent lesions early.

Outlook and Prognosis

Outlook and Prognosis

Lobomycosis usually progresses slowly over months or years rather than causing a sudden systemic illness. Localized disease may be controlled or removed, while extensive disease can be difficult to treat and may leave scars, altered skin, or effects on movement. Early specialist assessment can help guide treatment and limit lasting problems.

When Should You See a Doctor

When Should You See a Doctor?

Get medical advice

Persistent skin lesions need evaluation

Arrange a medical assessment for a skin bump, plaque, or nodule that persists or enlarges, especially after travel or work in a tropical outdoor environment. Seek urgent care for rapidly worsening redness or swelling, severe pain, pus, fever, significant bleeding, or loss of function near a joint.

Bring information about when the lesion began, how it has changed, travel or residence in endemic regions, outdoor or occupational exposures, injuries, and previous treatments. Photographs showing progression may also help the clinician understand how the lesion has developed.

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