Ключевые слова: abnormal, aging, allergic, background, beaus, brittle nails, calcium, close up, clues, damaged, defect, defective, deficiency, deformed, diet, disease, diseased, diseases, female, finding, finger, fingernail, fingernails, health, horizontal, iron, isolated, lines, longitudinal, lunula, male, mineral, moons, nail, normal, person, pit, pits, pitting, problem, psoriasis, ridges, rough, small, surface, symptoms, thumb, uneven, vertical, white,