The Dark Band the Client Wants Buffed Out

A band is a message from the matrix.

• The nail plate is produced by the nail matrix. Cells are pushed out and keratinize; the plate then slides forward over the nail bed and emerges at the cuticle. Because growth is longitudinal, anything the matrix produces continuously leaves a longitudinal stripe, not a spot.
• Therefore a band running from cuticle to free edge tells you the pigment is being deposited at the matrix and has been for the entire time that segment of plate was forming - roughly a year, which matches her history.
• Widening means the band of activity at the matrix is broadening, not that the same stripe is being carried out.
• Splinter hemorrhages are tiny bleeds along the longitudinal ridges of the nail bed; here they sit in the same line, which points to the same area.
• Darkening of the proximal nail fold over the band is the concerning detail: pigment reaching the surrounding skin suggests the process is not confined to the plate.
• The longitudinal ridges on both thumbs are a common age-related change and unrelated to the band.

A single dark band on a single digit, widening, with periungual pigment, is a pattern that has to be medically evaluated.

Decline the service and refer. Do not buff, do not curette, do not apply overlay.

• Buffing removes plate but does not remove pigment that is inside the plate; the request cannot be fulfilled, and abrading the plate destroys the surface you would need for adhesion.
• An overlay seals the area, hides changes, and delays a diagnosis. That is the harm: time.

What argues against a harmless cause:

• No trauma history. A subungual hematoma requires bleeding under the plate. It travels outward with plate growth, has a well-defined proximal edge, and gradually disappears as the plate grows out. A year later, a hematoma from a single injury would have grown off the end.
• Single digit, single band, widening. Stable, symmetric pigmentation in multiple nails is a different picture from one changing nail.
• Periungual skin involvement. Pigment crossing onto the surrounding skin is the classic reason a clinician will biopsy.
• Splinter hemorrhages in the same line. Not diagnostic alone, but it does not reassure.

So the pattern - one digit, one widening band, no injury, pigment at the fold - means subungual melanoma has to be excluded by someone qualified to do it. You cannot exclude it, so you do not treat it.

What to say (keep your scope):

"I can't tell you what this is - I'm not qualified to diagnose it, and I won't guess. What I can tell you is what I see: one dark band on one nail, it's wider than it was, and there's a little darkness in the skin at the base. That's a pattern where the right next step is a dermatologist, not a manicure. I'm not going to file it or cover it, because covering it would hide it and filing won't remove it. If it turns out to be nothing, I'd be glad to do your nails - bring me a note or just come back once you've been seen."

Points to hit: no diagnosis, no alarmist prediction, no "it's probably nothing," an explanation of why you are declining, and an offer to serve her afterward.

What goes in the record:

• Date and time, and the fact that a service was requested and declined.
• Objective description only: single longitudinal band, right thumb, width, brown-black, cuticle to free edge, reported duration and widening, two splinter hemorrhages, increased pigmentation of the proximal nail fold, ridges on both thumbs, no pain/swelling/discharge.
• "Advised client to have this evaluated by a dermatologist before nail services; client informed I cannot diagnose."
• No speculation, no diagnosis, no commentary on her appearance or habits.