and Treating Circular Fungal Infections on the Skin - Dermatology

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Circular fungal infection on the left foot with a completely white appearance?


Hello Doctor: I am currently seeing a dermatologist for a circular patch of tinea on my left foot that has been progressively worsening.
I have been applying a topical anti-inflammatory medication for about 3 to 4 days, followed by applying Bifonazole cream for three days, but it continues to peel and remains red and swollen.
I am hesitant to continue applying it due to concerns about allergies or side effects.
I then switched to another clinic where I applied Clotrimazole cream during the day and Betamethasone cream at night since May.
It has been a month, and I am unsure if the fungal infection is improving.
Can a major hospital perform a fungal culture or skin biopsy? Would taking Sporanox (Itraconazole) capsules be advisable? I have seen some online users mention it, but I am uncertain about what to do.
Thank you.

Ms. Chen, 40~49 year old female. Ask Date: 2024/06/02

Dr. Wu Yuxin reply Dermatology


Some medical centers have equipment that can scrape off skin flakes for microscopic examination to check for the presence of fungal hyphae.

Reply Date: 2024/06/02

More Info


When dealing with circular fungal infections on the skin, it is crucial to understand the nature of the infection, the treatment options available, and how to manage any adverse reactions that may arise from the medications used. Based on your description, it sounds like you have been experiencing a persistent fungal infection, possibly tinea corporis (ringworm), which can be quite stubborn and may require a multifaceted approach to treatment.

Firstly, it is important to recognize that fungal infections can sometimes lead to skin reactions such as peeling, redness, and irritation, especially when topical antifungal treatments are applied. The medications you mentioned, such as Nizoral (ketoconazole) and other antifungal creams, are commonly used to treat these infections. However, if you are experiencing significant side effects like excessive peeling and inflammation, it may indicate that your skin is reacting negatively to the treatment, or that the infection is not fully resolving.

In your case, it is advisable to stop using the topical treatments that are causing irritation and consult a dermatologist as soon as possible. A healthcare professional can assess the condition of your skin and determine whether the current treatment is appropriate or if a different approach is needed. They may also perform a skin scraping or culture to identify the specific type of fungus involved, which can guide more effective treatment options.

Regarding the use of oral antifungal medications like Sporanox (itraconazole), these can be effective for more extensive or resistant fungal infections. However, they should only be taken under the supervision of a healthcare provider, as they can have side effects and interactions with other medications. If your dermatologist believes that your infection warrants systemic treatment, they will provide you with the appropriate dosage and duration.

In terms of managing the skin's reaction to the infection and treatment, here are some general tips:
1. Moisturization: Use a gentle, fragrance-free moisturizer to help combat dryness and peeling. Look for products that contain ceramides or hyaluronic acid, which can help restore the skin barrier.

2. Avoid Irritants: Steer clear of harsh soaps, scrubs, or any products that may further irritate the skin. Opt for mild, pH-balanced cleansers.

3. Keep the Area Clean and Dry: Fungi thrive in warm, moist environments, so keeping the affected area clean and dry is essential. After bathing, ensure the area is thoroughly dried, especially in skin folds.

4. Wear Loose Clothing: Tight clothing can exacerbate irritation. Opt for loose-fitting, breathable fabrics to minimize friction and moisture buildup.

5. Monitor for Secondary Infections: If you notice any signs of secondary bacterial infection (increased redness, warmth, swelling, or pus), seek medical attention promptly.

6. Follow Up: Regular follow-up appointments with your dermatologist are crucial to monitor the progress of the treatment and make any necessary adjustments.

In summary, while fungal infections can be challenging to treat, a combination of proper diagnosis, appropriate medication, and supportive skin care can lead to successful outcomes. Always consult with a healthcare professional before making changes to your treatment plan, especially when dealing with persistent or severe skin conditions.

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