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- Presentation
Onycholysis: Causes, Diagnosis, and Management
Description
The transcript reviews onycholysis, defined as separation of the nail plate from the nail bed, most commonly distal and usually due to trauma, irritants, or other environmental factors. It also covers less common causes such as psoriasis, onychomycosis, phototoxicity, allergic contact dermatitis, systemic disease, and tumors. Exam clues help distinguish causes: environmental cases often show brittle or thin nails with a normal nail bed, psoriasis may show an erythematous rim, red dots, and pitting, onychomycosis tends to have jagged edges, and traumatic onycholysis usually has smooth edges without erythema. Management centers on gentle nail care, clipping nails short to prevent a lever effect, reducing frequent handwashing and sanitizer use, protecting hands with gloves, and avoiding nail cosmetics until recovery. Chronic cases may become persistent due to the disappearing nail bed phenomenon. Superinfection with yeast or Pseudomonas should be considered, with vinegar soaks or topical treatments used when indicated. Nail clipping, dermoscopy, and sometimes PAS or PCR can aid diagnosis. Topical tretinoin has limited case-report support. Special subtypes include taxane-induced onycholysis, for which frozen gloves may reduce risk during chemotherapy, and allergic contact dermatitis from manicure products, which improves with allergen avoidance and can mimic psoriasis.
View moreConclusions
- Onycholysis has many possible causes, but trauma, irritants, and other environmental exposures appear to be the most common, while idiopathic cases are rare.
- Careful exam and onychoscopy can help distinguish environmental onycholysis from psoriasis, onychomycosis, and traumatic causes by identifying characteristic edge changes and inflammatory signs.
- The mainstay of treatment is gentle nail care, including keeping nails short, minimizing moisture and trauma, and avoiding nail cosmetics until the nail has recovered.
- Chronic onycholysis can lead to the disappearing nail bed phenomenon, which may make reattachment difficult or permanent after prolonged disease.
- Superinfection is common in onycholysis, so clinicians should remain alert for yeast and Pseudomonas and treat co-infection when present.
- Topical or oral antifungals may be needed when yeast or Candida contributes to the nail changes.
- Topical retinoids such as tretinoin may help some cases by improving nail plate adherence, although the evidence is limited.
- Taxane chemotherapy can cause hemorrhagic onycholysis, and frozen gloves or cooling during infusion may reduce the risk.
- Allergic contact dermatitis from acrylates, especially with gel and home manicure products, is an increasingly common mimic of psoriasis and improves with allergen avoidance.
- Patients with contact allergy may still tolerate alternative nail products in some cases, but counseling should emphasize that avoiding the offending allergen is the key to resolution.
- Ankad BS, Gupta A, Alekhya B, Saipriya M. Indian Dermatol Online J. 2020.
- Dias PCR, Miola AC, Miot HA. An Bras Dermatol. 2019.