Green Discoloration Under a Lifted Acrylic
Six weeks after a full set of liquid-and-powder acrylic, a client returns with lifting along the right index finger and a dark olive-green to black discoloration on the nail plate. The spot starts near the cuticle and has spread about 4 mm toward the free edge. The nail plate looks intact, there is no pus, no swelling, and she reports no pain, but she says it "looks gross" and has been hiding it with polish. She wants the acrylic soaked off and a new full set applied today because she has a job interview in two days. Her other nine nails are intact with no lifting. She is healthy, takes no medications, does not bite her nails, and has no history of trauma to that finger. The technician has an electric file with a 180-grit bit, a soak-off bowl, nippers, and a bottle of 70% alcohol.
1. What is the most likely explanation for the discoloration, how would you distinguish it from other possibilities, and should a new full set be applied today?
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The picture - product lifting, a green-black stain confined to the plate, no pain, no pus, no swelling, no trauma - points to bacterial colonization by Pseudomonas aeruginosa, commonly called "greenies." Moisture wicks into the gap created by lifting and stays there, and the bacteria produce the green pigment. It is not a mold in the usual sense, and it is not a nail fungus.
Distinguish it this way:
- Subungual hematoma (bruise): dark red-purple, usually from a known injury, and it migrates outward with nail growth rather than hugging the lifted edge.
- Onychomycosis: thickened, crumbly, yellow-white nail with debris under the free edge; the plate itself changes texture. Here the plate is intact.
- Paronychia: redness, swelling, tenderness, pus at the fold - an infection of the surrounding tissue, which needs medical referral.
No new enhancement today. Applying product over an active bacterial site seals moisture and organisms against the plate and allows the discoloration to spread under a fresh set the client cannot see. The honest answer is that the stain is in the plate, will not vanish, and must grow out; she should be offered removal, a clean dry nail, and a return visit once the plate is stable, with a referral if pain, spreading, or pus appears.
2. Describe the safe removal and nail-plate care, and explain why the stain should not be filed away.
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Removal should be gentle and controlled:
- Shorten and thin the product with the e-file at low speed, light pressure, and a medium bit, staying well away from the lifted area so product dust and debris are not driven under the gap. Never file into the natural plate.
- Soak off the remaining product in acetone following the manufacturer's time, then remove residue with a wooden pusher - no metal scraping.
- Clean the plate with soap and water and dry it thoroughly; a brief wipe with alcohol is acceptable once the plate is intact, but it is not a treatment.
- Buff only enough to smooth surface debris. The pigment sits within the plate layers. Filing until the color disappears means removing functional plate, causing thinning, sensitivity, and a worse surface for any future product. It does not remove the bacteria any faster than growth does.
- Keep the nail short, dry, and product-free, advise the client to dry her hands well and avoid prolonged soaking, and have her return in two to three weeks so the technician can check the leading edge.
Because the spot is near the cuticle, the visible pigment will take roughly three to six months to grow out completely - that is the honest timeline to give her, not "it'll be gone next week."
3. What should be documented and what should the client be told about prevention and about the job interview?
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Documentation should record: the date, the location and size of the discoloration, that the product was lifted, that no pain, pus, or swelling was present, the service performed (removal only), the fact that no enhancement was applied and why, and the referral criteria given. A photograph with consent is useful. A signed note that the client was informed and chose to proceed with removal only protects both parties.
What to tell her:
- For the interview: she can wear regular polish on the dry, intact nail if she chooses, but she should not have a new acrylic or gel set over the discolored area. Short, clean, lightly polished nails are perfectly presentable.
- Prevention is about moisture and maintenance. Book fills every two to three weeks so lifting is caught early; dry the hands thoroughly after washing; use cuticle oil on the surrounding skin, not under the product; avoid picking or prying at lifted edges; never let a gap sit for weeks.
- Return sooner if the color darkens or spreads, if the fold becomes red, swollen, or tender, or if pus or a bad odor appears. Those findings mean a medical referral, not a nail appointment.
- Set the expectation that this is a temporary cosmetic problem, not a disease, but that reapplying over it would make it worse.