Fungal Infections
What are they
Fungal infections are caused by pathogenic fungi and can affect the skin, nails, mucous membranes, and even internal organs. Depending on the type of fungus and the affected area, fungal infections are classified as superficial, subcutaneous, or systemic.
They appear in both healthy individuals, especially under conditions of moisture, heat, poor hygiene and in immunocompromised patients, in whom the infection can become more extensive and dangerous. The most common forms are:
- Dermatophytic infections (e.g. athlete’s foot, body or scalp ringworm)
- Candidiasis (e.g. oral, genital, or nail yeast infection)
- Pityrosporum (Malassezia) – responsible for tinea versicolor
Diagnosis
Diagnosis of fungal infections is initially based on clinical evaluation by a dermatologist. This is followed by laboratory testing, which may include potassium hydroxide (KOH) microscopy, fungal culture, and in doubtful or resistant cases, skin biopsy. In cases of deep or systemic mycoses, imaging tests such as X-rays or CT scans may be required.
Early intervention is crucial to prevent relapses and complications.
Symptoms
The clinical features of fungal infections vary depending on the type of fungus and the location:
Skin: redness, scaly patches, itching or burning, with well-defined edges
Nails: thickening, yellowing, discoloration, or detachment from the skin
Mucous membranes: whitish patches (as in oral candidiasis), pain or discomfort
Systemic forms: fever, fatigue, shortness of breath, pain in specific organs – usually in immunocompromised individuals
Categories
Pathogenic fungi are classified based on their mode of action and the area they infect:
- Dermatophytes (e.g. Trichophyton, Epidermophyton, Microsporum): Infect keratinized tissues such as skin, hair, and nails. They cause the so-called “Tinea” infections (e.g. Tinea pedis – feet, Tinea corporis – body, Tinea capitis – scalp).
- Yeasts, mainly of the genus Candida: Affect mucous membranes (mouth, genitals), folded areas of skin, and nails. Candida albicans is the most common cause of candidiasis.
- Opportunistic fungi: Such as Aspergillus, Cryptococcus, and Mucorales, which cause severe systemic fungal infections in immunosuppressed individuals (e.g. transplant patients, HIV, chemotherapy).
Risk Factors
Certain conditions promote the development of fungal infections:
- Excessive moisture or sweating
- Poor hygiene or non-breathable clothes/shoes
- Chronic use of antibiotics or corticosteroids
- Diabetes or metabolic disorders
- Immunosuppression (e.g. HIV, chemotherapy, organ transplants)
- Recent use of antibiotics that disrupt normal flora
Categories of Fungal Infections
Fungal infections are classified based on the depth of tissue involvement:
- Superficial: The most common forms. Affect skin, nails, and mucous membranes. Include Tinea, candidiasis, and tinea versicolor. Usually not life-threatening but cause significant discomfort and aesthetic concerns.
- Subcutaneous: Caused mainly by traumatic introduction of fungi into the dermis or subcutaneous tissue. More common in rural areas and have a chronic course (e.g. sporotrichosis).
- Systemic: Affect internal organs (lungs, brain, kidneys). Rare but potentially fatal and require specialized medical treatment. Mostly affect immunocompromised individuals.
Treatment
Treatment is determined by the type of infection, the location, and the patient’s overall condition. Mild superficial forms are treated with topical antifungal preparations in the form of cream, lotion, or spray. More extensive or resistant infections require systemic treatment with oral antifungals such as fluconazole, itraconazole, or terbinafine. In severe systemic cases, intravenous agents such as amphotericin B are used. At the same time, managing predisposing factors is important, such as controlling blood sugar in diabetics or adjusting immunosuppressive therapy where possible.
Prevention
Prevention is especially important for vulnerable populations and includes:
- Thorough hygiene and proper drying after bathing
- Use of comfortable, cotton, well-ventilated breathable clothing
- Avoiding the sharing of personal items (e.g. towels, shoes)
- Careful use of antibiotics or corticosteroids
- Regular monitoring of patients with known immunosuppression
Fungal infections are a common health issue, but with timely diagnosis and appropriate treatment, they can be effectively managed. Prevention and awareness remain critical tools in limiting their spread.