Human papillomavirus (HPV) infection is one of the most common viral infections affecting epithelial tissues. Although HPV is widely associated with anogenital infections and oropharyngeal cancers in adults, it may also affect the oral mucosa of children and adolescents.
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This article provides an updated clinical guide on HPV transmission in children, oral lesion characteristics, differential diagnosis, and early detection strategies relevant to pediatric dental practice.
✅ Introduction
Human papillomavirus (HPV) is a non-enveloped double-stranded DNA virus belonging to the Papillomaviridae family. More than 200 HPV genotypes have been identified, several of which exhibit tropism for oral epithelial tissues.
In the oral cavity, HPV is associated with benign proliferative lesions such as:
▪️ Oral squamous papilloma
▪️ Verruca vulgaris
▪️ Condyloma acuminatum
▪️ Focal epithelial hyperplasia (Heck disease)
HPV types 6 and 11 are most frequently related to benign oral lesions, while HPV-16 and HPV-18 are associated with malignant transformation in the oropharynx.
Early detection in pediatric patients is critical because clinical manifestations may mimic other oral lesions, potentially delaying diagnosis.
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Understanding the transmission pathways of HPV in pediatric patients is fundamental for clinical evaluation.
1. Vertical transmission
Vertical transmission occurs from mother to child, particularly during vaginal delivery when the mother has active HPV infection.
This route has been associated with juvenile-onset recurrent respiratory papillomatosis, which may also involve oral mucosa.
2. Horizontal transmission
HPV may be transmitted through direct skin-to-skin or mucosal contact, including:
▪️ Close contact with infected caregivers
▪️ Contact with siblings or children with cutaneous warts
▪️ Oral contact with infected mucosa
3. Autoinoculation
Children with cutaneous warts on the hands or fingers may transfer the virus to the oral cavity through:
▪️ Nail biting
▪️ Finger sucking
▪️ Oral manipulation of lesions
4. Indirect transmission (fomites)
Although less common, HPV DNA has been detected on objects such as:
▪️ Toothbrushes
▪️ Pacifiers
▪️ Toys
▪️ Eating utensils
5. Sexual transmission or abuse
When condyloma acuminatum is detected in the oral cavity of a child, clinicians must consider the possibility of sexual transmission, including sexual abuse, and follow appropriate multidisciplinary evaluation protocols.
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HPV-associated oral lesions present distinct clinical features that allow preliminary recognition during dental examination.
1. Oral Squamous Papilloma
▪️ Most common HPV-related oral lesion
▪️ Associated with HPV types 6 and 11
▪️ Appears as exophytic, cauliflower-like growths
▪️ Usually pedunculated
▪️ Color ranges from white to pink
Common locations:
▪️ Tongue
▪️ Soft palate
▪️ Uvula
▪️ Lips
2. Verruca Vulgaris
▪️ Related mainly to HPV types 2 and 4
▪️ Firm hyperkeratotic papule
▪️ Typically small (more less 5 mm)
▪️ May appear as solitary or multiple lesions
Common locations:
▪️ Labial mucosa
▪️ Tongue
▪️ Palate
3. Condyloma Acuminatum
▪️ Often associated with HPV types 6 and 11
▪️ Sessile lesions with broad base
▪️ Usually larger than papillomas
▪️ May appear multiple and clustered
Locations include:
▪️ Labial mucosa
▪️ Lingual frenulum
▪️ Soft palate
4. Focal Epithelial Hyperplasia (Heck Disease)
▪️ Linked to HPV types 13 and 32
▪️ Multiple soft papules or nodules
▪️ Color similar to surrounding mucosa
▪️ Often found in children and adolescents
Frequent locations:
▪️ Labial mucosa
▪️ Buccal mucosa
▪️ Tongue
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Early detection requires a systematic oral examination and appropriate complementary tests.
1. Clinical examination
Dentists should evaluate:
▪️ Lesion morphology
▪️ Surface texture
▪️ Location and distribution
▪️ Number of lesions
2. Histopathological evaluation
Excisional biopsy is recommended for definitive diagnosis. Histological findings may include:
▪️ Koilocytosis
▪️ Papillary epithelial proliferation
▪️ Hyperkeratosis
3. Molecular detection
Advanced diagnostic methods include:
▪️ Polymerase chain reaction (PCR)
▪️ DNA hybridization
▪️ In situ hybridization
These tests allow HPV genotype identification.
📊 Comparative Table: Differential Diagnosis of HPV-Related Oral Lesions
| Oral Lesion | Key Clinical Characteristics | Diagnostic Considerations |
|---|---|---|
| Oral Squamous Papilloma | Pedunculated, cauliflower-like exophytic lesion; usually solitary; associated with HPV-6 and HPV-11. | Requires biopsy to confirm HPV involvement and exclude verruca vulgaris. |
| Verruca Vulgaris | Hyperkeratotic papule with rough surface; often related to hand warts. | Clinical similarity with papilloma; histopathology necessary. |
| Condyloma Acuminatum | Sessile lesions with broad base; frequently multiple and larger. | Evaluation required to rule out sexual transmission. |
| Focal Epithelial Hyperplasia (Heck Disease) | Multiple soft nodules; mucosal color; common in children. | Often self-limiting but biopsy may confirm HPV types 13 and 32. |
| Irritation Fibroma | Smooth, firm nodule caused by chronic trauma. | Lacks viral etiology; histology differentiates from papillomatous lesions. |
HPV infections in the pediatric oral cavity remain underdiagnosed due to the similar clinical presentation with other benign oral lesions. Pediatric dentists play a critical role in recognizing suspicious lesions and initiating appropriate diagnostic procedures.
Recent studies highlight that HPV prevalence in the oral cavity of children ranges between 2% and 11%, depending on geographic and diagnostic variables. Early identification of HPV lesions not only improves patient management but also allows investigation of possible transmission routes.
Additionally, the increasing implementation of HPV vaccination programs may significantly reduce the prevalence of HPV-associated diseases, including oral lesions.
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For pediatric dental practitioners, the following measures are recommended:
▪️ Perform systematic oral mucosal examinations in all pediatric patients.
▪️ Document and photograph suspicious lesions.
▪️ Consider biopsy for persistent lesions (>2 weeks).
▪️ Evaluate possible transmission pathways, including vertical or horizontal transmission.
▪️ Educate parents about HPV vaccination, which is recommended starting at 9 years of age.
▪️ Refer patients for multidisciplinary evaluation when necessary.
✍️ Conclusion
HPV-related oral lesions in children, although relatively uncommon, represent an important diagnostic challenge in pediatric dentistry. Recognition of clinical characteristics, transmission routes, and appropriate diagnostic methods is essential for early detection and management.
The pediatric dentist plays a key role in screening, diagnosis, patient education, and referral, contributing to the prevention of HPV-related oral disease and improving long-term oral health outcomes.
📚 References
✔ Gillison, M. L., Broutian, T., Pickard, R. K. L., Tong, Z. Y., Xiao, W., Kahle, L., ... & Chaturvedi, A. K. (2012). Prevalence of oral HPV infection in the United States, 2009–2010. JAMA, 307(7), 693–703. https://doi.org/10.1001/jama.2012.101
✔ Syrjänen, S. (2018). Oral manifestations of human papillomavirus infections. European Journal of Oral Sciences, 126(S1), 49–66. https://doi.org/10.1111/eos.12438
✔ Neville, B. W., Damm, D. D., Allen, C. M., & Chi, A. C. (2016). Oral and Maxillofacial Pathology (4th ed.). Elsevier.
✔ Syrjänen, K. (2010). Current concepts on human papillomavirus infections in children. APMIS, 118(6-7), 494–509. https://doi.org/10.1111/j.1600-0463.2010.02620.x
✔ WHO. (2022). Human papillomavirus vaccines: WHO position paper. World Health Organization. https://www.who.int/publications/i/item/who-wer9710-69-92
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