สารที่เป็นสาเหตุให้เล็บเปลี่ยน (ต่อ) NAIL COLOR CHANGES | ศูนย์พิษวิทยารามาธิบดี คณะแพทยศาสตร์โรงพยาบาลรามาธิบดี มหาวิทยาลัยมหิดล

BLUE
Aniline poisoning (blue-violet) Cyanide (diffuse dark blue) Drugs (systemic effects) Chloroquine (blue-brown) Chlorpromazine (blue-black) Fluorouracil (diffuse) Minocycline (blue-gray) Phenacetin (purple) Quinacrine	warfarin (purple) Zidovudine (dark blue) Enchondroma Fungal infections Gentian violet (purple) Oxalic acid Silver (diffuse azure) Wilson’s disease

YELLOW
Bichromates Chromium salts (ochreous) Dinitro-orthocresol Drugs Amphotericin B Beta-carotene Iodochlorhydroxyquine Nicotine Penicillamine Santonin	Tetracyclines Vitamin D toxicity Fluorescein Hydrofluoric acid Fungal infections Pachyonychia congenita Paraquat Photographic developer Picric acid Yellow-nail syndrome

WHITE
Arsenic (bands) Anemia (diffuse) Cirrhosis (Terry’s nails) Congenital leukonychia (partial white) Darier’s disease (longitudinal red & white striations) Emetine hydrochloride Fever, high (bands) Fungal infections Half-and-half nail (proximal white, distal pink)	Hypoalbuminemia (bands) Hypocalcemia Malnutrition (diffuse) Paraquat (bands) Pellagra (diffuse) Punctate leukonychia (spots) Renal disease, chronic Thallium Tinea Zinc deficiencies (diffuse)

GRAY/BLACK
Ammoniated mercury (gray) Cyclophosphamide (black) Daunorubicin (black bands) Doxorubicin (black bands) Fungal infections Gold salts Hair dyes Malnutrition (black bands)	Melanoma, subungual Mercury products Phenolphthalein (diffuse gray) Photographic developer (black) Proteus mirabilis infection Red wine (black) Silver (dark gray) Silver nitrate

GREEN
Fungal infections Prophyllin	Pseudomonas infection

RED
Angioma Carbon monoxide Darier’s disease (longitudinal red & white striations) Glomus tumor	Hemorrhage (red-brown) Nail namel Selenium Tetracycline