Fingernails and toenails can reflect underlying health conditions and should be addressed to uncover the cause. Nails can be pitted, clubbed, spoon, thickened, raised, have dark tips, lines, yellow, green or other discolorations. The symptoms can be indicative of disease, injury, fungus or improper nail clipping or treatments. Diagnosis of nail conditions can be determined by the dermatologist, who can then provide appropriate treatment.