Green Under the Acrylic, Brown in the Thumb
A 34-year-old client comes in at week three for a fill on her acrylic set. On the right index finger the product has lifted along the sidewall, and the space underneath is stained dark green-black with a faint musty odor; the plate under the stain is soft and has separated from the bed by about 1 mm. On the left thumb a brown-to-black band roughly 4 mm wide runs from the cuticle to the free edge. She says it has been there "maybe eight months," has not changed, and that her father had "a mole taken off his back." She wants you to file the stain out and put the acrylic back on so nothing shows in her sister's wedding photos on Sunday.
1. Identify the index-finger problem and decide what happens to the enhancement today.
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The green-black stain under a lifted edge, with a musty odor, is a bacterial colonization (classically Pseudomonas) - the discoloration is in the space created by lifting, not a stain on top of the plate.
Action:
- Remove the enhancement on that nail. Do not file aggressively into the stained plate; thin, soft plate is already compromised.
- Reduce the plate gently, disinfect per your protocol, and let the nail dry.
- Do not reapply product over it today. Sealing moisture and bacteria back under an enhancement recreates the problem and can worsen separation.
- Refer for evaluation if there is pain, spreading discoloration, drainage, or the plate is crumbling or separating further.
- Advise her the discolored portion will grow out; reapply only when the plate is firm and the discoloration is gone.
Reasoning: dryness and time fix this; covering it does not. The soft, separated plate is what makes it more than cosmetic.
2. What is your obligation regarding the left thumbnail, and why is it different from the index finger?
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Refer - do not treat, buff, or cover it.
The band is a pigmented streak of the nail plate, not surface stain and not product. Features that warrant medical referral:
- Width: 4 mm is wide for a benign streak.
- Location and duration: thumb, present eight months, and you cannot confirm it is stable.
- Family history: a relative with a removed skin lesion raises melanoma concern.
You cannot diagnose, and you do not need to - you only need to recognize "needs a physician's eyes" and say so plainly. Filing over it destroys the record the physician would want and delays care. Do not apply enhancement over a pigmented band without clearance, and do not tell her it is "probably nothing." Document what you saw, its size, and that you advised evaluation.
3. She insists both nails be covered for Sunday. Write the response you would actually give.
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"I can't put product back over the green area - it's a bacterial problem under a lifted edge, and sealing it would make it worse. I can take the product off both, tidy the natural nails, and give you a clean natural look for the wedding. The brown stripe on your thumb isn't something a nail tech should file or cover; a streak like that, that wide and that long, needs a doctor or dermatologist to look at it. I'll put the note in your record and I'll happily do your nails once the green has grown out and you've had the thumb checked."
Why this works: it separates the two problems, gives her a workable option for Sunday, avoids diagnosis, and states the referral as a standard of care rather than a judgment about her. Offer a natural-nail service only if the plate is intact enough to buff lightly and no product touches the affected area.