Pearl: Congenital hypertrophy of the lateral nail folds can be treated with tape
Congenital hypertrophy of the lateral nail folds is relatively common in children and normally improves with age. Koilonychia may also occur simultaneously and can be viewed as a physiologic process in this age group. The etiology of the underlying disorder is due to anomalous periungual soft-tissue changes of the bilateral halluces; the resulting overgrowth can partially cover the nail plate. Although usually a self-limiting condition, the changes can cause inflammation and discomfort due to an ingrown nail.4 Dr. Tosti advised that by simply taping and retracting the bilateral overgrowth, the condition can be more readily resolved. This simple treatment can be demonstrated in the office and subsequently performed at home.
Pearl: Onychomycosis is uncommon in children
Onychomycosis occurs in less than 1% of children.5 Several factors are responsible for this decreased prevalence. More rapid nail growth and smaller nail surface area decreases the ability of the fungi to penetrate the nail plate.6 Furthermore, children have a diminished rate of tinea pedis, leading to less neighboring infection. When onychomycosis does affect this patient population, it commonly presents as distal subungual onychomycosis and favors the fingernails over the toenails. Treatment options usually parallel those of the adult population; however, all medications for children are considered off-label use by the US Food and Drug Administration. Dr. Tosti explained that oral granules of terbinafine can be sprinkled on food to help with pediatric ingestion. Topical therapies should also be considered; children usually respond better than their adult counterparts due to their thinner nails, which grant enhanced drug delivery and penetration.6
Pearl: Acute paronychia can be due to nail-biting and sucking
Acute paronychia is inflammation of the proximal nail fold. In children, it frequently is a result of mixed flora induced by nail-biting and sucking. Management involves culturing the affected lesions and is effectively treated with warm soaks alone. Dr. Tosti highlighted that Candida in the subungual space is a common colonizer and is typically self-limiting in nature if isolated. Candida can be cultured more readily in premature infants, immunosuppressed patients, and those with chronic mucocutaneous candidiasis. Patients with chronic mucocutaneous candidiasis can exhibit periungual inflammation involving several digits. The differential can include nail psoriasis, as both can demonstrate dystrophic changes. The differential for localized paronychia includes herpetic whitlow and can manifest as vesicles under the proximal nail fold.
Final Thoughts
These clinical pearls are shared to help deliver utmost care to our pediatric patients presenting with nail pathology. For example, a child exhibiting melanonychia can cause alarm due to the possibility of underlying melanoma; given the rarity of neoplasia in these patients, a conservative approach is favored to help avoid unnecessary biopsies and subsequent scarring. Similarly, it is important to be aware of the common colonizers of the subungual area, particularly Candida, to avoid unessential medications with potential side effects. The examples demonstrated help shed light on the management of pediatric nail diseases.
Acknowledgment
This article is possible thanks to the help of Antonella Tosti, MD (Miami, Florida), who contributed her time and expertise at the University of Miami Pediatric Grand Rounds to expand the foundation and knowledge of pediatric nail diseases.