Toenail Green Line: Causes, Diagnosis, and Treatment Options #3411337 (License: Personal Use)

This medical illustration shows a green linear streak on the lateral edge of the big toenail, commonly associated with Pseudomonas aeruginosa colonization (green nail syndrome), trauma-induced pigment deposition, or early fungal involvement. The green hue typically arises from bacterial byproducts or melanin changes in the nail matrix, and may be accompanied by nail thickening or odor if infection is present. Early identification helps differentiate benign causes from pathologic ones requiring treatment.

Used in dermatology, podiatry, or primary care web content explaining nail abnormalities; matches user intent seeking visual aid for self-assessment or educational purposes about green nail discoloration.