B43.0

Clinical Causes: Infection from specific dark-pigmented fungi, commonly from the genera Fonsecaea, Phialophora, and Cladophialophora. Introduction of fungi into the skin through cuts, abrasions, or other skin injuries, especially in environments with soil, plant material, or decaying vegetation. Prolonged exposure to humid, warm conditions that favor fungal growth. Repeated trauma or skin injuries in affected individuals, which facilitate fungal penetration and subsequent colonization.

Key Symptoms: Chronic, verrucous (wart-like) skin lesions that are often raised and rough in texture. Lesions tend to develop slowly and may enlarge over time. color variations, including brown, black, or hyperpigmented patches. Lesions might be itchy or mildly uncomfortable. Potential secondary bacterial infections, causing further inflammation or oozing. In some cases, multiple lesions can appear across various parts of the body, especially on exposed areas like the limbs and face.

Diagnosis Path: Skin biopsy to examine tissue samples microscopically for fungi. Fungal culture to identify the specific type of fungi responsible. Direct microscopic examination with potassium hydroxide (KOH) prep, revealing characteristic fungal elements. Histopathological assessment can show pigmented fungi within the skin layers.

Treatment Protocols: Oral antifungal medications like itraconazole or terbinafine, often required for prolonged periods. Topical antifungal agents, such as ciclopirox or imidazole creams, may be used for limited lesions. Physical therapies, including surgical removal of stubborn or large lesions, may be considered in some cases. Addressing any secondary bacterial infections with appropriate antibiotics. Preventing new infections through protective clothing and avoiding trauma to vulnerable skin areas.