Nail Polish Staining: Dark nail polish can lead to yellow staining on nails due to interaction with keratin, says dermatologist Dr. Allawh.
Fungal Infection: Nail thickening and debris accumulation beneath can cause yellow nails due to fungus invasion, explains Dr. Zeichner.
Onycholysis: Nail separation from the bed causes yellow or opaque appearance, notes Dr. Zeichner. It's common in hands-on workers
Vitamin Deficiency: Malnutrition can lead to yellow nails, Dr. Zeichner points out. Blood tests can identify deficiencies like zinc or B12.
Smoking: Yellow nails indicate smoking exposure due to tar, states the American Academy of Dermatology. Quitting may lead to Harlequin nails with stained.
Self-Tanner: DHA in self-tanners can stain nails yellow, warns Dr. Zeichner. Vigorous hand washing post-application or wearing gloves during application.
Hereditary Factors: Yellow nail syndrome, a rare condition, can be hereditary, affecting nails, respiratory system, and limbs, according to the Genetic and Rare Diseases