The Bottom Line

Onycholysis is the separation of the nail plate from the nail bed beneath it. The lifted area looks white, yellow, or greenish because air has entered the space. While it is rarely painful itself, it creates an opening for bacterial and fungal infections. Treatment focuses on identifying and removing the underlying cause, keeping the area dry, and clipping back the detached portion. Without fixing the cause, the nail will not reattach.

What Is Onycholysis?

Onycholysis (pronounced oh-NIK-oh-LY-sis) is the medical term for when the nail plate separates from the nail bed. Instead of the nail lying flat and firmly attached, a portion lifts up, creating a space between the nail and the skin below. This space fills with air, giving the lifted area a distinctive white, yellow, or occasionally green or brown discoloration.

It usually starts at the free edge (tip) of the nail and progresses toward the base. The separation itself is typically painless — you may not even notice it until you see the color change. However, the gap creates a warm, moist, dark environment that is ideal for bacteria and fungi to colonize, often leading to secondary infection that causes odor and further discoloration.

Onycholysis is one of the most common nail complaints seen in dermatology. Fingernails and toenails can both be affected, though the causes can differ. Women are affected more often than men in most studies, partly due to longer nails and nail product use.

What Causes Onycholysis?

There are many possible causes, which is why identifying the specific trigger for your case matters so much for treatment:

Physical and Chemical Causes

  • Trauma: the most common cause; includes repeatedly tapping nails on hard surfaces, using nails as tools, stubbing toes, or dropping something heavy on the foot. Even minor repeated trauma over time loosens the nail-bed bond.
  • Prolonged water exposure (wet work): hands in water for hours each day weaken the bond between nail and nail bed. Dishwashers, nurses, hair stylists, and cleaners are at high risk.
  • Nail products: acrylic nails, gel nails, nail glue, and harsh nail polish removers (acetone) can damage the nail-bed attachment. Forceful application or removal of artificial nails is a leading cause in younger women.
  • Aggressive cleaning under nails: using sharp tools to clean under nail edges disrupts the natural seal (hyponychium).

Skin Conditions

  • Psoriasis: causes nail pitting, crumbling, and onycholysis. Nail psoriasis affects up to 50% of people with skin psoriasis and 80-90% of those with psoriatic arthritis.
  • Eczema (dermatitis) of the fingertip: inflammation near the nail affects the attachment zone.
  • Lichen planus of the nail: can cause nail thinning, ridging, and separation.

Infections

  • Onychomycosis (nail fungus): fungal infection destroys the nail plate and nail bed, causing lifting, thickening, and crumbling. This is one of the most common nail conditions overall.
  • Pseudomonas bacterial infection (green nail syndrome): bacteria colonize the onycholytic space, producing green pigment.

Medical Conditions

  • Thyroid disease: both overactive (hyperthyroid, causing “Plummer’s nails” — onycholysis starting at the ring finger) and underactive thyroid can affect nails
  • Iron deficiency anemia: affects nail integrity and can cause brittleness and separation
  • Diabetes mellitus
  • Connective tissue diseases: lupus, scleroderma, Raynaud’s phenomenon

Medications

  • Photo-onycholysis: certain medications (tetracyclines, fluoroquinolones, NSAIDs, psoralens) make nails sensitive to light so that sun exposure causes lifting — this typically affects all nails simultaneously
  • Chemotherapy agents (taxanes, bleomycin) frequently cause nail changes including onycholysis
  • Retinoids (isotretinoin)

What Does Onycholysis Look Like?

The lifted area appears lighter than the attached nail because air has replaced the underlying nail bed. You may see:

  • A white or yellowish color at the nail tip that extends back toward the base (the border between attached and detached nail is often curved)
  • Green or black discoloration if bacteria or fungi have colonized the space
  • Debris under the nail if fungal infection is present
  • A smooth or crumbly nail surface depending on the cause
  • Pitting or other nail surface changes if psoriasis is involved

Treatment: What Works and What Doesn’t

The most important principle of treating onycholysis: the detached nail will not reattach to the nail bed no matter what you do. The new nail growing from the base is the only nail that will attach properly. Treatment is about eliminating the cause so new nail grows in normally, and keeping the detached portion trimmed back so it does not catch on things or harbor infection.

Step 1: Clip Back the Detached Nail

Trim the separated portion of the nail back to where it is still attached. This removes the bacteria and fungi’s hiding place and makes the area easier to treat and keep dry. Do this carefully with clean nail scissors; cut until you reach attached nail and stop there.

Step 2: Keep It Dry

This cannot be overstated. Moisture is the enemy. Wear waterproof gloves for all wet tasks. Dry hands and nails completely after washing. Avoid prolonged water exposure. If you work in a wet environment, discuss protective strategies with your dermatologist.

Step 3: Treat the Underlying Cause

  • Fungal infection: topical antifungal (ciclopirox, efinaconazole, tavaborole) applied to the nail bed, or oral antifungal (terbinafine) for severe cases
  • Bacterial infection (green nail): topical antibiotic drops; moisture control
  • Psoriasis: nail psoriasis treatment (topical corticosteroids under occlusion, topical vitamin D analogs, or biologic therapy for widespread psoriasis)
  • Drug-induced: discuss stopping or switching the causative medication with your prescribing doctor; protect nails from sunlight if photo-onycholysis is suspected
  • Thyroid disease or anemia: treating the systemic condition often improves nail attachment over months

Step 4: Protect the Regrowth Area

Keep nails short (to reduce leverage and catching), avoid harsh nail products, and be gentle with nail care while you wait for healthy new nail to grow in. Biotin supplements have some evidence for brittle nail improvement but do not specifically treat onycholysis.

How Long Does Recovery Take?

Nail regrowth is slow. Fingernails grow approximately 3 mm per month; full regrowth of a fingernail takes 6 months. Toenails grow about 1-1.5 mm per month, so full regrowth takes 12-18 months. Recovery means watching new, properly attached nail grow in from the base over this time — patience is essential.

When to See a Dermatologist

  • Nail lifting is spreading or has not improved after several weeks of keeping the nail dry
  • The area under the lifted nail develops an odor, green or black color, or increasing tenderness
  • Multiple nails are affected (suggests a systemic cause)
  • You have other nail changes alongside the lifting (pitting, thick crumbly nail, brown-red spots under the nail)
  • You are unsure of the cause and want a diagnosis before treating
  • You have diabetes or compromised circulation in your hands or feet

Frequently Asked Questions

Can I glue my nail back down?

No — this is one of the most common mistakes people make. Applying nail glue or pressing the nail back down traps moisture, bacteria, and debris in the space, making infection almost certain. The lifted nail cannot reattach — it needs to be clipped back while new nail grows in naturally.

Why did my nail lift after getting gel or acrylic nails?

Gel and acrylic nails require buffing and chemicals that weaken the nail-bed seal. Forceful removal — especially peeling rather than soaking off — physically tears the nail plate away from the nail bed. Once the bond is broken, the nail needs months to grow back fully. If this keeps happening, your nails may need an extended break from artificial nail systems.

Is onycholysis the same as a nail fungus?

Not necessarily, though nail fungus (onychomycosis) is a common cause of onycholysis. The two can co-exist, and a lifted nail provides easy entry for fungal infection. Other causes (trauma, psoriasis, thyroid disease, medications) can cause onycholysis without any fungal infection. Your dermatologist can take nail clippings for culture or microscopy to determine if fungus is present.

My nails keep lifting no matter what I do. What am I missing?

Recurrent or persistent onycholysis almost always means the underlying cause has not been identified or fully treated. Common missed causes include: ongoing contact with water or chemicals (even brief daily exposure adds up), low-grade nail fungal infection that was undertreated, psoriasis affecting the nails without obvious skin involvement, or a systemic issue like thyroid disease. A thorough evaluation by a dermatologist is the best step.

References

  1. Tosti A, Piraccini BM. “Onycholysis.” In: Baran and Dawber’s Diseases of the Nails and Their Management. 4th ed. Wiley-Blackwell; 2012.
  2. Fawcett RS, Linford S, Stulberg DL. “Nail abnormalities: clues to systemic disease.” American Family Physician. 2004;69(6):1417–1424.
  3. Rich P. “Onycholysis: causes and treatment.” Cutis. 2002;69(2):137–140.
  4. Langley RGB, Duffin KC, Naldi L, et al. “Psoriasis: epidemiology, clinical features, and quality of life.” Annals of the Rheumatic Diseases. 2005;64(Suppl II):ii18–ii23.

Trusted Resources

Always consult a board-certified dermatologist for diagnosis and personalized treatment recommendations. This information is for educational purposes only and does not replace professional medical advice.