Green Under the Lift
A regular client comes in three weeks after her last acrylic set. On the right index finger the product has lifted along the lateral sidewall, and there is a dark green-black discoloration on the nail plate beneath the lifted corner. The plate is slightly separated at the free edge but is not thickened, not crumbly, and there is no pain, no pus, and no odor. She cannot remember hitting it, though she moved apartments last month. She has a wedding on Saturday and asks you to file the product down, "soak the stain out with a little bleach," and build a new set on top the same day.
1. What is the most likely condition, and which findings point to it rather than to the alternatives?
Read the worked answer
Most likely: a bacterial colonization of the pocket under the lifted product, commonly called "greenies" (typically Pseudomonas). The green-black pigment is a byproduct of bacterial growth in a moist, dark space - which is precisely what a lifted edge creates.
Findings that support it:
- Color confined to the area under the lift, not the whole plate. A generalized plate change points elsewhere.
- No thickening and no crumbling. Onychomycosis classically thickens and crumbles the plate and produces subungual debris.
- No pain, pus, warmth, or odor. Those would suggest an acute paronychia or abscess rather than surface colonization.
- A lifting product plus time. The mechanism fits: separation, moisture, warmth, bacteria.
Alternatives and why they fit less well:
- Subungual hematoma - usually red-purple to black, usually with remembered trauma, and the discoloration migrates out with growth rather than sitting in a pocket under the lift.
- Onychomycosis - lacks thickening, crumbling, and debris.
- Melanonychia - a longitudinal band from the matrix, not a stain under a lifted edge.
State your observation, not a diagnosis. "Here is what I see, and here is what I cannot treat" is the correct register.
2. What do you do today, and what do you tell her about Saturday?
Read the worked answer
Do not apply bleach, and do not build over it. Bleach is caustic to living tissue, is not a treatment for a nail plate, and cannot "lift out" pigment that is bound in discolored keratin - that keratin has to grow out. Sealing a moist, colonized pocket under a fresh set makes the conditions worse, not better, and the new product will lift again from the same corner.
Today:
- Remove the enhancement, working gently and only on product.
- Lightly reduce the discolored keratin - enough to remove stain, not enough to thin the plate or reach the bed.
- Do not reapply over the affected area.
- Keep the nail dry and clean; offer a natural-nail finish if she wants one, with no product over the site.
- Refer: a physician or dermatologist should see it if it spreads, if the separation deepens, if pain or pus develops, or if it does not improve as the nail grows out.
About Saturday: the wedding is three days away; this will not resolve in three days, and covering it will not hide the problem from anyone who looks closely. Offer a short set on the other nine nails and a clean, polished natural nail on the index finger - that looks intentional and is honest. Document the date, the appearance, the advice given, and her response. If she goes elsewhere and someone covers it, your note is what protects you.
3. Suppose instead the plate were thickened and yellow-brown, crumbling, with debris packed under the free edge, and her toenails looked the same. How does your answer change, and why does the distinction matter beyond the diagnosis?
Read the worked answer
Your answer changes from "manage and monitor" to "do not treat, refer, and lock down your implements."
That picture - thickened, discolored, crumbly plate with subungual debris, matching toenails - is consistent with a fungal infection (onychomycosis) and possibly tinea pedis on the feet. Both require medical diagnosis and prescription treatment; nothing in your cabinet treats them, and no topical cosmetic product or vinegar soak is a substitute.
What changes in practice:
- No enhancement on the affected nails. Product traps moisture and can worsen the environment; also, the client will attribute any later problem to your work.
- Refer for diagnosis, and do not name the organism to the client as a fact. Describe and refer.
- Single-use everything on that hand or foot; discard files, buffers, and any porous item.
- Disinfect non-porous implements at full labeled contact time - fungal spores are more resistant than vegetative bacteria, and a shortened soak that "gets by" for bacteria is not adequate here.
- Check the feet. Matching toenails is the clue that this may be a foot-wide problem, which changes your basin protocol and your questions for other clients.
Why the distinction matters legally and professionally: the greenies case is something a nail technician can recognize, avoid aggravating, and monitor with a referral trigger. The fungal case requires a diagnosis you are not licensed to make and a treatment you are not licensed to provide. Treating it - filing it down and selling a"fungus" product, or covering it - is the same scope-of-practice error with a worse outcome.