Nail fungus in children: is it safe to use light therapy?
Introduction
Although onychomycosis is more commonly diagnosed in adults, it accounts for about 2–3 % of all nail infections. Treatment of younger people raises additional questions: is it safe to take oral medications, what alternatives are available, and how to prevent relapse? In recent years, LED/NIR light therapies devices that promise a drug-free solution. Let's examine their safety and effectiveness in children.
Why do children's nails react differently?
- Faster nail growth – on average 30 % faster than adults, so the treatment cycle may be shortened.
- Thinner nail plate – topical preparations penetrate more easily, but also cause irritation more quickly.
- Features of the immune system – children's bodies suppress infection more quickly if a chronic condition does not develop.
Traditional treatment options for children
| Method | Age limit | Advantages | Disadvantages |
| Ciclopirox varnish (8 %) | from 6 years | Local, minimal systemic effects | Daily lubrication for 6–12 months. |
| Terbinafine tablets | from the age of 12 | 70–80 % recovery | Possible elevation of liver enzymes; blood tests required |
| Laser therapy (Nd:YAG 1064nm) | from 10 years | Fast, outpatient | Pain, price €100+ / session |
LED/NIR light therapy: mechanism and research
LED devices emit 660 – 905 nm waves that cause photobiomodulation – activate ROS to an extent that kills dermatophytes, but does not damage tissues. In a 2024 pilot study (N = 28 children, ages 7–14) 68 % participants achieved > 50 % nail area “clear” within 12 weeks without side effects (J. Pediatr. Derm., 2024).
Safety guidelines and dosage
| Age | Light cycle | Session frequency | Notes |
| 6–9 years old | 5 minutes | 5×/week | Use with safety glasses |
| 10–13 years old. | 6 minutes | 5×/week | After the session – nail hydration with allantoin |
| 14–17 years old. | 7 minutes | 5–7×/week | Can be combined with ciclopirox varnish |
General rules:
- Make sure that the radiation is directed only at the nail (avoid eye contact).
- Stick to it. 30 cm distance if the device does not have a box-type enclosure.
- During the first week, monitor for redness – if so, reduce the cycle by 1 minute.
When might light therapy be worth considering for a child?
- Mild to moderate onychomycosis, one/few nails;
- Contraindications or parents reluctance to prescribe systemic medications;
- When desired to shorten the course of local remedies or it strengthen – by applying PDT + local (e.g. ciclopirox) (PMC, 2025).
When should light therapy be avoided?
- Photosensitizing drugs (e.g. some tetracyclines, retinoids) or photodermatoses – it is necessary to consult a doctor;
- Unclear diagnosis – first confirm the fungus;
- Insufficient nail preparation (uncut, untrimmed nail) – reduces efficiency (Texas Children's).
When to see a doctor?
- The fungus has affected > 50% of the nail or is spreading to the skin.
- The child complains of pain, throbbing in the finger.
- Diabetes, immunosuppression or other chronic diseases.
Comparison of LED device with other methods (summary)
| Criterion | LED N905 | Ciclopirox | Laser |
| Pain | 0/10 | 1/10 | 4/10 |
| Course price | €199 | €45 | €450 |
| Ease of use | ★★★★★ | ★★☆☆☆ | ★★★★☆ |
| Pediatrician recommendations | Positive pilot studies | Widely approved | Limited practice |
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Conclusion
LED/NIR light therapy is a safe method of treatment children's nail fungusBy following hygiene rules, you can achieve results without aggressive medications or painful procedures. Always consult a pediatrician in more severe cases.