A Dark Band and Transverse Grooves
A 62-year-old retired teacher books a manicure and asks for acrylic overlays to “hide” a problem. On her left thumb, a 3 mm wide dark brown band runs from the cuticle to the free edge; it has been present for about five months, has widened slightly, and the nail plate is smooth with no pain or history of injury. On all her fingernails, transverse grooves lie about 10 mm from the cuticle; she says they appeared after a three-week hospitalization for pneumonia three months ago. Her cuticles are intact and she has no other skin findings. She takes a blood thinner and reports easy bruising. She says her primary care doctor “doesn't think it's anything,” but she has not seen a dermatologist. She wants the overlay today and asks the technician not to “make a big deal” of the band.
1. Explain the anatomy involved and what each finding most likely represents.
Read the worked answer
The nail plate is produced by the matrix, which sits under the proximal nail fold; the lunula is the visible portion of the distal matrix. The nail bed lies beneath the plate, and the cuticle seals the space between the plate and the skin. A longitudinal brown band reflects increased melanin produced by melanocytes in the matrix. It can be benign, such as a lentigo or nevus, but a single, widening band in an older adult is a warning sign for subungual melanoma and requires dermatologic evaluation. The transverse grooves are Beau's lines, caused when severe illness temporarily interrupts matrix production. Fingernails grow roughly 3 mm per month, so grooves about 10 mm from the cuticle fit an illness about three months earlier. The grooves themselves are harmless and will grow out. The technician can explain these structures but cannot diagnose the cause of the pigmentation.
2. Should the technician apply the acrylic overlay today? Defend the decision using scope of practice and client-safety reasoning.
Read the worked answer
The overlay should not be applied over the undiagnosed band. Nail technicians are not trained or licensed to diagnose pigmented lesions, and covering the nail with an opaque enhancement could hide widening, color change, or pigment spreading onto the cuticle - changes that help a physician detect melanoma earlier. The request to “not make a big deal” does not remove that risk. The technician can still perform a basic manicure if the skin is intact, but should avoid aggressive cuticle work and should not use the appointment to reassure the client that the band is harmless. The blood thinner and easy bruising are additional reasons to file gently and avoid nicking the skin. The correct judgment is to decline the overlay, explain the reason in plain language, and refer the client to a dermatologist. The refusal protects both the client and the technician's license.
3. How should the technician communicate the referral and document the visit?
Read the worked answer
The technician should use neutral, non-diagnostic language: “I'm not able to tell you what this is, but a change like this should be looked at by a dermatologist before we cover it.” She should avoid saying “it's nothing” or “it's cancer.” She can point out that the grooves are consistent with the recent illness and will grow out, which gives the client a clear, non-alarming explanation for one finding while keeping the focus on the band. She should offer to schedule the overlay only after the client has been evaluated and has written clearance if the physician allows it. Documentation should include the date, the client's report of the band's duration and change, the visual description without a diagnosis, the fact that the service was declined and why, the referral made, and the client's response. The record should be objective, signed, and retained according to the salon's policy and New Mexico Board requirements.