Green Toenails: What Is It and How to Treat It

If you've noticed a greenish tint on one or more of your toenails, you're likely dealing with a condition called green nail syndrome. It’s most commonly caused by a bacterial infection, particularly by a type of bacteria called Pseudomonas aeruginosa. This bacteria thrives in moist environments and can invade the nail bed when there’s a break or separation between the nail and the nail bed.

What Causes Green Toenails?

• Prolonged exposure to moisture (sweaty shoes, wet socks)

• Tight or poorly ventilated footwear

• Trauma to the nail (e.g., stubbing your toe, running injuries)

• Tools that weren’t properly sanitized

• Pre-existing nail damage or fungal infections

Symptoms to Look For:

• Green, blue-green, or black discoloration of the nail

• Foul odor (in some cases)

• Nail may lift or feel loose

• Surrounding skin may look irritated

How to Treat Green Toenails:

• Prescription topical or oral antibiotics – Depending on the severity, a prescription-strength antibiotic may be needed.

• Custom foot care plan – Especially if the issue is recurring or linked to other nail conditions like fungus.

Prevention Tips:

• Keep feet clean and dry

• Wear breathable shoes and moisture-wicking socks

• Disinfect shoes and nail tools regularly

• Don’t ignore small nail injuries—they can open the door to infection

If you're seeing green on your toenail, it's best not to wait. Schedule a visit with Dr. Amanda Matz's podiatry office in Auburn California and let us help you clear it up quickly and safely—so you can get back to healthy, happy feet!