A healthy nail can appear red and shiny and glossy. If the nail is diseased, it may appear as a stained, thickened, or scaly area. This is often seen in clinical cases of nail fungus, or gray nails. It also includes nail changes in patients with psoriasis, as well as nail nevi and dotted depressions of the nail. Nail lesions are generally complex, so it is important to go to the hospital as soon as possible after the nail lesion appears to be diagnosed. If it is caused by a systemic disease, the primary disease should be treated. For specific diagnosis and treatment, it is recommended to go to a regular hospital as soon as possible.