Nail Psoriasis (Toenails) 2026: Causes & Treatment | DPM

Quick answer:Nail psoriasis causes pitting, yellow-brown “oil spots,” thickening, and lifting of the toenails, and it can look just like fungus. A podiatrist can tell them apart and treat the nails while coordinating with your dermatologist on the underlying psoriasis. Call (810) 206-1402.

✅ Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist · Last updated April 6, 2026

Medically Reviewed by Board-Certified Podiatrists at Balance Foot & Ankle Specialists. Updated for 2026.

Quick Answer: What Is Nail Psoriasis?

Table of Contents

• Quick Answer
• What Causes Nail Psoriasis
• Symptoms to Watch For
• Nail Psoriasis vs. Toenail Fungus
• How We Diagnose It
• Treatment Options
• When to See a Podiatrist
• Frequently Asked Questions

What Causes Nail Psoriasis?

Nail psoriasis occurs when the immune system mistakenly attacks healthy nail cells, causing rapid cell turnover in the nail matrix and nail bed. The exact trigger varies from person to person, but common contributing factors include genetics, stress, trauma to the nail, certain medications, and infections. If you have skin psoriasis anywhere on your body, there is a significantly higher chance of developing nail involvement.

The nail matrix — the tissue under your cuticle where new nail cells are formed — is the primary area affected. When psoriasis targets this zone, it disrupts normal nail growth patterns and leads to the characteristic changes patients notice over time.

Symptoms of Toenail Psoriasis

In our clinic, patients with nail psoriasis typically present with one or more of the following signs:

• Pitting: Small dents or depressions across the nail surface — the most common sign we see
• Onycholysis: Separation of the nail from the nail bed, often starting at the tip and progressing backward
• Discoloration: Yellow-brown patches under the nail (sometimes called “oil drop” spots)
• Thickening: The nail becomes abnormally thick and difficult to trim
• Crumbling: The nail edges become brittle and break apart
• Ridging: Horizontal or vertical grooves running across the nail
• Subungual hyperkeratosis: Chalky buildup under the nail plate

Nail Psoriasis vs. Toenail Fungus: How to Tell the Difference

This is one of the most common questions we get in our practice. Both conditions can cause thickened, discolored, crumbling nails — but the treatment is completely different. Nail psoriasis is autoimmune, while toenail fungus is an infection caused by dermatophyte organisms. A lab test or biopsy can confirm the diagnosis. Key differences include: psoriasis typically causes pitting and oil-drop spots, affects multiple nails symmetrically, and often accompanies skin plaques elsewhere. Fungus usually starts in one nail and spreads, rarely causes pitting, and has a distinct musty odor.

How We Diagnose Nail Psoriasis

Diagnosing nail psoriasis starts with a thorough clinical exam of all your nails and skin. Our board-certified podiatrists look for the characteristic pitting patterns, oil-drop discoloration, and nail bed changes that distinguish psoriasis from fungal infections. We may take a nail clipping for microscopic analysis or fungal culture to rule out onychomycosis. In some cases, a small nail biopsy provides a definitive answer. We also review your medical history for any prior psoriasis diagnosis, psoriatic arthritis symptoms, or family history of autoimmune conditions.

Treatment Options for Nail Psoriasis

Treating nail psoriasis requires patience, as nails grow slowly and visible improvements often take 3–6 months. In our practice, we use a stepwise approach tailored to each patient’s severity:

• Topical treatments: High-potency corticosteroid creams, vitamin D analogs (calcipotriol), and tazarotene applied around and under the nail
• Intralesional injections: Corticosteroid injections into the nail matrix for localized, resistant cases
• Systemic medications: For severe cases or when psoriatic arthritis is present, oral or biologic medications prescribed in coordination with your dermatologist or rheumatologist
• Nail care guidance: Keeping nails trimmed short, avoiding trauma, wearing properly fitted shoes, and moisturizing the nail folds daily
• Phototherapy: Targeted UV light therapy in some cases

When to See a Podiatrist

See a podiatrist promptly if you notice: Sudden nail separation with pain or bleeding, green or black nail discoloration suggesting secondary infection, nail changes accompanied by joint swelling or stiffness in your toes, rapidly worsening nail destruction despite home care, or foul-smelling discharge from under the nail. These signs can indicate complications that need professional treatment before permanent nail damage occurs.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your toenail condition, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.

Frequently Asked Questions

Can nail psoriasis be cured?

Nail psoriasis is a chronic condition without a permanent cure, but it can be effectively managed. Many patients achieve significant improvement with consistent treatment, and some experience long periods of remission.

Is nail psoriasis contagious?

No. Unlike toenail fungus, nail psoriasis is an autoimmune condition and cannot be spread to other people through contact, shared footwear, or communal showers.

Should I see a dermatologist or a podiatrist?

Both. A podiatrist specializes in the foot and nail structure, while a dermatologist manages the systemic psoriasis component. In our practice, we work closely with dermatology teams to coordinate the best treatment plan.

The Bottom Line

Nail psoriasis is a treatable condition — but accurate diagnosis is the first step. If your toenails are pitted, thickened, discolored, or separating from the nail bed, don’t assume it’s just a fungal infection. A board-certified podiatrist can determine the true cause and set you on the right treatment path.

Ready to get answers? Call Balance Foot & Ankle at (810) 206-1402 or book your appointment online. We see patients in Howell and Bloomfield Township, Michigan.

Clinical References

1. Jiaravuthisan MM, Sasseville D, Vender RB, et al. Psoriasis of the nail: anatomy, pathology, clinical presentation, and a review of the literature on therapy. Journal of the American Academy of Dermatology. 2007;57(1):1-27.
2. Rich P, Scher RK. Nail psoriasis severity index: a useful tool for evaluation of nail psoriasis. Journal of the American Academy of Dermatology. 2003;49(2):206-212.
3. Baran R. The burden of nail psoriasis: an introduction. Dermatology. 2010;221(Suppl 1):1-5.

Podiatrist-Recommended Products for Toenail Conditions

These are the products we recommend most often in our clinic for toenail health, fungus treatment, and nail recovery:

🏆 Doctor Hoy’s Natural Pain Relief Gel — Our top recommendation for topical nail and skin care. Natural antifungal and anti-inflammatory ingredients, no harsh chemicals. Apply nightly around and under the nail.

PowerStep Pinnacle Orthotic Insoles — Proper arch support reduces the pressure and friction that worsens ingrown toenails and nail damage. Fits most shoe types.

Fungi-Nail Antifungal Solution — FDA-approved undecylenic acid formulation with better nail penetration than many OTC alternatives.

How long does it take a toenail to grow back?

6-12 months for a full big toenail. Smaller toenails 4-6 months. Speed varies with age, circulation, and nutrition.

Will this affect other nails?

Trauma affects only the injured nail. Fungal infection can spread without treatment. Systemic causes affect multiple nails simultaneously.

Should I cover the nail or leave it open?

Cover with a breathable bandage during work or activity. Leave open at night for healing. Keep dry and clean.

More questions patients ask

What does psoriasis under toenails look like?

Toenail psoriasis presents as pitting (tiny ice-pick holes) in the nail, yellow-brown oil drop discoloration, nail thickening, crumbling nail edges, nail separation from the nail bed (onycholysis), and sometimes salmon-colored spots under the nail. It often affects multiple nails simultaneously.

How is toenail psoriasis treated?

Podiatrists and dermatologists treat nail psoriasis with topical steroids or vitamin D analogs applied under the nail, intralesional corticosteroid injections, biologics for severe systemic psoriasis, and nail debridement. Treatment is long-term and requires patience—nails improve slowly over months.

Can nail psoriasis be mistaken for nail fungus?

Yes—both cause thickening, discoloration, and nail separation, making them difficult to distinguish clinically. A podiatrist can take a nail clipping for lab analysis to rule out fungal infection. Importantly, the two can coexist—psoriatic nails are more vulnerable to fungal invasion.

Still have a question about coverage or cost? Book online and we will check your benefits before your visit: Book in Howell · Book in Bloomfield Township. Prefer to talk it through first? Call (810) 206-1402.