Introduction

Tinea manuum is a relatively uncommon fungal infection that affects the hands.^1,2 It is primarily caused by dermatophytes, fungi that thrive on keratinised tissues such as skin, hair, and nails. This condition often presents symptoms like dry, scaling skin on the palms, itching, and vesicular lesions.¹ This article provides a comprehensive overview of tinea manuum, including its causes, risk factors, symptoms, diagnostic techniques, treatment options, and preventive measures.

Aetiology

The primary causative agents of tinea manuum are dermatophytes, with Trichophyton rubrum being the most common pathogen.^1,2 Other species, such as Trichophyton mentagrophytes, Epidermophyton floccosum, Trichophyton verrucosum and Trichophyton interdigitale, can also be responsible.¹ 

Transmission

Transmission occurs through direct contact with an infected individual or animal or indirectly via contact with contaminated objects like towels, clothing, or surfaces. Infection can also spread from one part of the body to another.¹

Causes and risk factors

The primary cause of tinea manuum is exposure to dermatophytes, which are fungi that can survive on the skin's outer layers. These fungi thrive in warm, moist conditions, making the hands an ideal site for infection. Several factors contribute to the development of tinea manuum, including:¹

• Direct contact with infected individuals
• Handling infected pets or touching contaminated surfaces increases the risk
• Occupational exposure, like workers in agriculture, are at higher risk
• Immunosuppression such as in conditions like diabetes, HIV/AIDS
• Picking area infected with this infection
• Chronic conditions like diabetes mellitus, hypertension, etc.
• Recurrent trauma to the hands
• Environmental factors like Warm, humid climates
• Excessive Sweating 

Signs and symptoms

The symptoms of tinea manuum vary depending on the severity of the infection and the individual’s immune response. Common symptoms include:¹

• Itching² and discomfort
• Pain
• Redness and inflammation
• Scaling and peeling
• Local lymphangitis in rare cases
• Blisters
• Thickening of the skin

Diagnosis of tinea manuum 

If you suspect that you have tinea manuum, it is important to seek medical attention for an accurate diagnosis. Experts recommend a triple confirmation approach:¹

• Clinical Examination
• Potassium Hydroxide (KOH) Microscopy
• Fungal Culture

Diagnostic methods include:¹

• Direct Microscopy: A scraping of scaly or pustular lesions is examined under a microscope. The sample is treated with KOH to dissolve keratin and reveal fungal hyphae. This test has a sensitivity of 73.3% and a specificity of 48%
• Culture Testing: Dermatophyte cultures help identify the fungal species. Cultures can take 2-6 weeks to grow. If available, antifungal susceptibility testing should be conducted to guide treatment
• Fluorescent Staining: Optical brighteners that bind to fungal cell walls can be used under fluorescence microscopy to improve detection rates
• Histopathology: When other skin diseases are suspected, a biopsy with periodic acid-Schiff (PAS) or Grocott-Gomori methenamine silver (GMS) staining can confirm the presence of fungal elements.
• Dermoscopy: A noninvasive tool that can show characteristic scaling patterns in the furrows and dermatoglyphics of the palm
• Polymerase Chain Reaction (PCR): Advanced molecular methods, including real-time PCR, are being used for rapid and precise detection

Treatment and management

Treatment options include:¹

• Treatment depends on the severity of the infection and patient factors. Whenever feasible, topical treatments are preferred to minimise the potential for drug interactions and adverse effects associated with oral antifungals
• Topical antifungals used are Terbinafine, Naftifine, Clotrimazole, and Fluconazole. Regimens typically last 4 to 6 weeks
• Systemic antifungal therapy is recommended in cases with severe infection, immunosuppression patients, or when the patient is not responding to topical antifungals
• The use of corticosteroids in tinea manuum is controversial. However, they may be beneficial in cases with severe inflammation, pruritus, or burning sensations. If prescribed, corticosteroids should be used simultaneously with antifungal therapy

Differential diagnosis

The differential diagnosis includes: ¹

• Psoriasis³
• Dyshidrotic eczema
• Contact dermatitis
• Herpetic whitlow of herpes simplex infection
• Bacterial bullous impetigo
• Cellulitis

Prevention of tinea manuum

Prevention is key to reducing the risk of tinea manuum and other fungal infections. Simple lifestyle changes and hygiene practices can help protect against the spread of dermatophytes. These include:¹

• Maintain good hand hygiene: Wash your hands regularly with soap and water, especially after touching potentially contaminated surfaces or coming into contact with infected individuals
• Keep your hands dry: Moist environments encourage fungal growth, so it is important to dry your hands thoroughly, particularly between the fingers, after washing them or after sweating
• Avoiding scratching: Scratching can spread the infection to other areas of the body or other individuals. Keeping the hands clean and using anti-itch treatments can help reduce the urge to scratch
• Follow-up care: It is important to follow up with a clinician to ensure that the infection has been fully treated

FAQs

Can tinea manuum return after treatment?

Yes, reinfection is common if preventive measures are not followed.

Is tinea manuum a serious condition?

It is usually mild but can become chronic if untreated.

Can tinea manuum cause secondary infections?

Yes, scratching can introduce bacteria, leading to cellulitis or abscesses.

Can tinea manuum affect children?

Yes, especially those in close-contact activities.

Can pets transmit tinea manuum?

Yes, infected cats, dogs, and livestock can spread the fungus.

Is tinea manuum more common in certain climates?

Yes, warm and humid environments increase the risk.

Can tinea manuum lead to a nail infection?

Yes, it can spread to the nails (onychomycosis).

Can tinea manuum heal on its own?

It rarely resolves without treatment and may worsen over time.

Can tinea manuum be completely cured?

Yes, with proper treatment and preventive measures.

Can diet help prevent tinea manuum?

A strong immune system helps, but no specific food prevents it.

Summary

Tinea manuum is a fungal infection that affects the hands and is caused by dermatophytes. It is a contagious condition that can spread through direct contact or contaminated surfaces. Symptoms of tinea manuum include itching, redness, scaling, and erythematous lesions. 

Accurate diagnosis of tinea manuum is essential to differentiate it from other skin conditions. The gold standard for confirmation includes potassium hydroxide (KOH) microscopy, which helps detect fungal hyphae in skin scrapings, and fungal culture, which identifies the specific dermatophyte but may take 2-6 weeks for results. Additional diagnostic tools such as fluorescent staining, histopathology, dermoscopy, and polymerase chain reaction (PCR) can improve detection accuracy. 

Treatment typically involves antifungal medications, either topical or oral, and good hand hygiene. Treatment depends on the severity of the infection. Mild cases typically respond well to topical antifungals such as terbinafine, clotrimazole, ketoconazole, and econazole, which should be applied for 2-6 weeks. 

Preventive measures such as regular handwashing, keeping the hands dry, and avoiding contact with infected individuals are essential in minimising the risk of developing tinea manuum. If left untreated, this fungal infection can lead to complications like secondary bacterial infection and lymphangitis. Therefore, controlling infection and making early diagnosis and treatment is crucial for a positive outcome.