B42.1

Clinical Causes: Inoculation of Sporothrix schenckii fungus into the skin through punctures or cuts, often from handling soil, plants, or organic matter. Trauma involving plant material, such as thorns, roses, or wood splinters. Occupational exposure, particularly among farmers, gardeners, or landscapers. Rarely, transmission from person to person or through contaminated objects.

Key Symptoms: Initial skin lesion: firm, painless, ulcerated nodule at the site of entry. Lymphatic spread: multiple nodules or ulcers developing along the lymphatic channels proximal to the initial lesion, often with a tender, cord-like appearance. Swelling and redness of the affected lymph nodes. Possible regional lymphadenitis with tenderness. In some cases, lesions may become ulcerative or suppurative. Localized or systemic symptoms like mild fever or malaise are uncommon.

Diagnosis Path: Clinical evaluation: identification of characteristic skin lesions and lymphatic streaks. Laboratory tests: culture of the lesion tissue to identify Sporothrix schenckii fungus. Histopathological examination: skin biopsy showing fungal elements within tissue. Molecular diagnostics: PCR testing may assist in identification in uncertain cases. Serological tests are generally less specific but may support diagnosis.

Treatment Protocols: Antifungal medications: the primary treatment involves oral antifungals such as itraconazole, typically administered over several months. Potassium iodide: an older therapy option that can be effective in some cases. Local measures: wound care and proper hygiene to prevent secondary infections. Referral to infectious disease specialists is recommended for complicated or resistant cases.