✅ Medically reviewed by Dr. Thomas Biernacki, DPM — Board-Certified Podiatrist · Last updated April 6, 2026
Last Updated: April 2026 | Reading Time: 9 min
This article is for informational purposes only and does not replace professional medical advice. Schedule an appointment for personalized care.
Quick Answer
Nail pitting — small dents, depressions, or ice pick-like holes in the nail surface — is most commonly caused by psoriasis (responsible for ~50% of cases), eczema/dermatitis, or alopecia areata. Isolated pitting on one toenail is usually from repetitive trauma (tight shoes) and is harmless. Pitting on multiple nails — especially when accompanied by nail thickening, ridging, or the “oil drop” sign — strongly suggests psoriasis and warrants evaluation. Treatment targets the underlying condition, not the pitting itself. See a podiatrist or dermatologist if: multiple nails are pitted, the nails are also thickening or discoloring, or you have joint pain (psoriatic arthritis screening).
In This Article
Finding small dents or depressions in your toenails can be unsettling — especially when you don’t know what’s causing them. Nail pitting is one of the most common nail abnormalities, affecting up to 10% of the general population and up to 50% of people with psoriasis. The pits themselves are painless and cosmetic, but they’re often a visible clue to an underlying condition that may benefit from treatment — particularly psoriasis, which can affect the joints as well as the skin and nails.
What Is Nail Pitting?
Nail pitting refers to small, shallow depressions (pits) in the surface of the nail plate. The pits are typically 1–2mm in diameter and can be scattered randomly across the nail or arranged in lines or grids. They form when there’s focal damage to the cells in the nail matrix (the growth center under the cuticle) — the damaged cells produce defective keratin at that spot, which creates a small divot in the nail surface.
The pattern, number, and distribution of pits provide diagnostic clues. Random, scattered pits across multiple nails suggest a systemic condition (psoriasis, alopecia areata). Geometric or grid-like pitting is characteristic of psoriasis. Deep, large pits are more common in psoriasis, while shallow, small pits are more common in eczema and alopecia areata. Pitting confined to one nail suggests local trauma rather than a systemic cause.
5 Causes of Nail Pitting
| Cause | Frequency | Pit Pattern | Associated Features |
|---|---|---|---|
| Psoriasis | ~50% of nail pitting cases | Deep, irregular; grid pattern | Oil drop sign, nail thickening, onycholysis, skin plaques |
| Eczema / Dermatitis | ~20% | Shallow, fine; irregular | Rough, ridged nails; eczema on hands/feet |
| Alopecia Areata | ~10% | Shallow, geometric; rows | Rough “sandpaper” nails; patchy hair loss |
| Trauma / Microtrauma | ~15% | Random; single nail | History of tight shoes, stubbing, or aggressive pedicure |
| Reactive Arthritis / Connective Tissue Disease | ~5% | Variable | Joint pain and swelling; other systemic symptoms |
Psoriasis and Nail Pitting
Psoriasis is the most common and clinically significant cause of nail pitting. Up to 50% of people with skin psoriasis develop nail changes, and nail pitting is the most frequent manifestation. Importantly, nail psoriasis can appear before skin psoriasis — in about 5% of cases, nail pitting is the first and only sign of psoriasis, sometimes preceding skin plaques by years.
Why psoriasis causes pitting: Psoriasis accelerates skin cell turnover throughout the body, including in the nail matrix. When psoriatic inflammation affects the nail matrix, it causes focal areas of parakeratosis (abnormal keratinization) that result in poorly formed nail plate cells. When these defective cells reach the nail surface, they crumble away, leaving the characteristic pits.
Other nail signs of psoriasis that often accompany pitting include: the “oil drop” sign (salmon-colored translucent spots under the nail plate), onycholysis (nail lifting from the nail bed at the tip), subungual hyperkeratosis (chalky debris building up under the nail), nail plate thickening and crumbling, and splinter hemorrhages (tiny dark lines running the length of the nail).
Psoriatic arthritis connection: This is the reason nail pitting deserves attention beyond cosmetics. Nail psoriasis is a strong predictor of psoriatic arthritis — a chronic inflammatory joint condition that can cause permanent joint damage if untreated. Studies show that 80% of people with psoriatic arthritis have nail involvement. If you have nail pitting along with joint pain, stiffness (especially morning stiffness lasting more than 30 minutes), or swollen fingers/toes (dactylitis, or “sausage digits”), prompt rheumatological evaluation is essential.
How to Diagnose the Cause
Pattern recognition is the primary diagnostic approach. Multiple nails with deep pitting plus other nail changes (oil drop sign, thickening, onycholysis) = psoriasis until proven otherwise. Shallow pitting with rough, sandpaper-like nails and patches of hair loss = alopecia areata. Pitting on one nail with a history of trauma or tight shoes = traumatic cause.
Skin examination. A careful skin exam looking for psoriasis plaques (well-defined, red, scaly patches) in typical locations — scalp, elbows, knees, lower back, and the intergluteal cleft — can confirm a psoriasis diagnosis when nail pitting is present. Many patients have mild psoriasis in hidden areas (scalp, ear folds) that hasn’t been previously diagnosed.
Blood work is ordered when inflammatory arthritis is suspected (ESR, CRP, RF, anti-CCP, HLA-B27) or to screen for associated conditions. There’s no blood test for psoriasis — it’s a clinical diagnosis based on nail and skin findings.
Nail biopsy is rarely needed but can be performed in ambiguous cases. A small sample from the nail matrix or nail bed is examined histologically to confirm the presence of psoriatic changes versus other causes.
Fungal testing. Because psoriatic nails and fungal nails can look similar (both cause thickening, discoloration, and crumbling), a nail clipping with KOH prep or fungal culture helps rule out onychomycosis. Importantly, fungal infection and psoriasis can coexist — the damaged psoriatic nail is more susceptible to fungal colonization.
Treatment by Cause
Psoriatic Nail Pitting
Topical treatment: High-potency topical corticosteroids (clobetasol) or vitamin D analogs (calcipotriol) applied to the nail folds and cuticle area can improve pitting over 3–6 months by reducing inflammation at the nail matrix. Tazarotene cream (a topical retinoid) applied to the nail plate has also shown benefit. These treatments require patience — improvement is slow because you’re waiting for a new, healthy nail to grow in.
Intralesional steroid injections: Corticosteroid injected directly into the nail matrix provides the most targeted anti-inflammatory effect and can significantly improve pitting within 2–3 months. These injections are uncomfortable but effective, and are typically performed 1–3 times at monthly intervals.
Systemic treatment: For severe nail psoriasis or when multiple nails are heavily involved, systemic therapies (methotrexate, cyclosporine, or biologic agents like adalimumab, secukinumab, or ixekizumab) provide the best outcomes. Biologic medications have shown dramatic improvement in nail psoriasis in clinical trials. Systemic treatment requires coordination with a dermatologist or rheumatologist.
Eczema-Related Pitting
Managing the underlying eczema with emollients, topical corticosteroids, and trigger avoidance reduces nail matrix inflammation and allows healthier nail growth over time. Keeping the hands and feet moisturized is key. Nail improvement follows eczema control by 3–6 months (the time for new nail to grow in).
Traumatic Pitting
Remove the source of trauma (properly fitting shoes, avoiding aggressive pedicures, protecting toenails during sports). The damaged nail will grow out and be replaced by a normal nail over 12–18 months. No treatment is needed for the pitting itself — just prevention of further trauma.
Alopecia Areata
Treatment focuses on the autoimmune condition itself. Nail improvement parallels treatment response. Topical corticosteroids, intralesional steroids to the nail matrix, and newer systemic treatments (JAK inhibitors like baricitinib) can improve nail changes alongside hair regrowth.
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Psoriatic and damaged nails are highly susceptible to secondary fungal infection. Tea tree oil provides natural antifungal protection when applied to the nail surface and surrounding skin. It also has anti-inflammatory properties that may help reduce periungual (around-the-nail) inflammation. Apply 1–2 drops to affected nails after urea cream as a preventive maintenance measure against fungal colonization.
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Check Price on Amazon⚠️ When Nail Pitting Needs Medical Attention
- Multiple nails affected with pitting, thickening, or discoloration — evaluate for psoriasis
- Joint pain or stiffness alongside nail pitting — screen for psoriatic arthritis (can cause permanent joint damage if untreated)
- “Sausage digits” (entire toe or finger is swollen) — hallmark of psoriatic arthritis
- Rapidly worsening nail changes — nail crumbling, complete nail destruction
- Patches of hair loss with nail pitting — evaluate for alopecia areata
- Nail pitting in children — should be evaluated to rule out systemic conditions early
Frequently Asked Questions
Can nail pitting be cured?
Nail pitting from trauma resolves on its own once the trauma is eliminated — you just need to wait 12–18 months for the new, undamaged nail to grow in. Nail pitting from psoriasis, eczema, or alopecia areata can be improved with treatment of the underlying condition, but it may recur if the condition flares. Biologic medications for psoriasis have shown the most dramatic and sustained improvements in nail pitting. The key is that you’re treating the disease, not the pitting — the pitting resolves as a consequence of controlling the underlying inflammation at the nail matrix.
Is nail pitting always a sign of psoriasis?
No — nail pitting has several causes, and psoriasis accounts for roughly half of all cases. Eczema, alopecia areata, trauma, and reactive arthritis also cause nail pitting. Single-nail pitting with a history of tight shoes or trauma is usually not psoriasis. However, if multiple nails are pitted — especially with other nail changes like the oil drop sign, thickening, onycholysis, or subungual debris — psoriasis is the most likely diagnosis. A skin exam for psoriasis plaques can help confirm or rule out the diagnosis.
How long does it take for pitted nails to grow out?
Toenails grow at approximately 1mm per month — much slower than fingernails (3mm/month). A complete toenail takes 12–18 months to grow from the matrix to the tip. Once the underlying cause is treated and the nail matrix is producing healthy nail cells again, you’ll need to wait the full 12–18 months for the previously pitted nail to grow out and be replaced by the new, smooth nail. Improvement is visible earliest at the cuticle (base of the nail) and gradually moves forward. This is why patience is essential in nail treatment.
Should I see a podiatrist or dermatologist for nail pitting?
Either can evaluate nail pitting effectively. A podiatrist is the right choice if the pitting is confined to the toenails, if you also have foot or toe joint symptoms, or if you need toenail care (debridement, nail procedures). A dermatologist is the right choice if you have widespread skin changes alongside the nail pitting, or if systemic psoriasis treatment is needed. For psoriatic arthritis concerns, a rheumatologist should be involved. In many cases, coordinated care between a podiatrist and dermatologist provides the best outcomes for nail psoriasis.
The Bottom Line
Nail pitting is most commonly caused by psoriasis, eczema, alopecia areata, or repetitive trauma. Single-nail pitting from trauma is harmless and grows out on its own. Multi-nail pitting — especially with other nail changes like thickening, discoloration, or the oil drop sign — strongly suggests psoriasis and warrants evaluation, particularly because nail psoriasis is linked to psoriatic arthritis. Treatment targets the underlying condition; the pitting resolves as the nail matrix inflammation is controlled. New, healthy nail growth appears at the cuticle and takes 12–18 months to fully replace the damaged nail.
Sources
- Jiaravuthisan MM, Sasseville D, Vender RB, et al. “Psoriasis of the nail: anatomy, pathology, clinical presentation, and a review of the literature on therapy.” J Am Acad Dermatol. 2007;57(1):1-27.
- Rich P, Scher RK. “Nail psoriasis severity index: a useful tool for evaluation of nail psoriasis.” J Am Acad Dermatol. 2003;49(2):206-212.
- Wilson FC, Icen M, Crowson CS, et al. “Incidence and clinical predictors of psoriatic arthritis in patients with psoriasis.” Arthritis Rheum. 2009;61(2):233-239.
- Tosti A, Piraccini BM, de Farias DC, et al. “Nail disorders in children.” Expert Rev Dermatol. 2008;3(3):393-408.
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Clinical References
- Jiaravuthisan MM, Sasseville D, Vender RB, Murphy F, Muhn CY. Psoriasis of the nail: anatomy, pathology, clinical presentation, and a review of the literature on therapy. J Am Acad Dermatol. 2007;57(1):1-27.
- Baran R, Dawber RPR, de Berker DAR, Haneke E, Tosti A. Diseases of the Nails and their Management. 3rd ed. Oxford: Blackwell Science; 2001.
- Rich P, Scher RK. Nail psoriasis severity index: a useful tool for evaluation of nail psoriasis. J Am Acad Dermatol. 2003;49(2):206-212.
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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)