New Dark Band on a Thumbnail
A 67-year-old client with type 2 diabetes books a manicure and asks you to cover a new dark brown streak on her right thumbnail with opaque polish. The band is about 4 mm wide, runs from the cuticle to the free edge, and has irregular edges. She denies hitting or injuring the thumb and says it appeared over 3 months. The surrounding skin is intact; she has no pain, but her cuticles are dry and she has mild onycholysis on the same nail. She is proud of her nails and does not want to see a doctor before her granddaughter's graduation in 2 days. She asks whether you can 'just put a dark color over it.'
1. What is your responsibility when you see this band, and can you apply opaque polish?
Read the worked answer
Recognize the finding but do not diagnose. A new, single, 4 mm irregular longitudinal brown band in an older adult, without trauma, is a reason for medical evaluation, not a cosmetic cover-up. Explain that you cannot tell what it is and that opaque polish would hide changes a doctor needs to see. You may perform a gentle manicure if the skin is intact and she consents, but use clear polish or no polish and avoid cutting or probing the nail or cuticle. Do not treat it as fungus or scrape the band. Encourage her to see a dermatologist or physician promptly, preferably before the graduation, and document that you advised this.
2. Which features would make this more urgent, and how does diabetes affect your decision?
Read the worked answer
Urgency increases with a single nail, a band that is widening or irregular, pigment extending onto the cuticle or side skin, nail splitting or destruction, and no history of injury. Those features warrant prompt dermatology evaluation because they can be associated with serious nail disease. Diabetes does not cause this band, but it matters for any service: check for wounds, redness, swelling, or loss of sensation, and avoid aggressive cuticle work. If she had an open sore or infection, postpone the manicure and refer. Do not let the graduation deadline override the need to evaluate a new pigmented band.
3. How do you stay within scope and document the interaction?
Read the worked answer
State clearly that you are not qualified to identify the cause and that your role is to refer. Do not say 'it's probably fungus' or 'it's just a bruise.' Record the band's location, width, color, borders, duration, absence of reported trauma, and the fact that you advised medical evaluation. Note that opaque polish was declined and clear polish or no polish was used. Keep the record factual and avoid alarming language. If the client refuses referral, still document the advice and offer the gentle service only if the skin and nail are intact. This protects the client and shows you followed scope-of-practice limits.