Not all nail diseases are gray nails, here mainly introduces several kinds of more characteristic benign nail tumors. 1, nail papilloma Nail papilloma is a kind of benign tumor of nail bed. Typical manifestations are: (1) A single red stripe appears, and the nail plate at the distal end of the red stripe may have crackles. (2) Keratinization can be seen under the nail plate, which corresponds to the longitudinal stripe, and is often misdiagnosed as a foreign object such as a wooden splinter that is lodged in the nail plate. Nail papilloma 2.Thymoplasmacytoma Nail papilloma is a benign tumor of nail matrix, which is usually painless and progresses slowly. Typical signs are: (1) thickening of the nail plate with excessive lateral curvature, and the thickened nail plate turns yellow in color. (2) Hollowing of the free edge of the nail plate is the specific sign of this disease, and the hollowing is easier to observe in the transverse section. Nail matrix tumor 3, pyogenic granuloma Pyogenic granuloma is a kind of common hemangioma, often occurring in the periungual or nail bed. Common etiologies include: pharmacogenetic (retinoids, antitumor, etc.), local mechanical injury, peripheral nerve injury (e.g., caused by cast immobilization), and systemic inflammatory diseases (cutaneous nodular disease, etc.). Purulent granuloma 4, hemangioblastoma Hemangioblastoma often has paroxysmal pain, which can be spontaneous or induced by pressure and cold; it can be observed through the nail plate with red or blue spots, and it can form a longitudinal red nail and form a notch at the distal end of the nail or form a crack right on the longitudinal red nail. Subungual hemangioblastoma 5, subungual exophytic bone warts Subungual exophytic bone warts are a kind of slow-growing benign proliferative osteochondral lesions. Trauma is the main predisposing factor, and it is most common in the bunion. Tumors usually occur from the nail bed or the lateral groove of the nail, in the early stage of the performance of porcelain white, the surface of the capillary dilatation, with the development of time surface hyperkeratosis. The first step is to make sure that you have a good understanding of how to use the information you have collected in the past and how to use it. Type A: the most common, mucus cysts are located between the distal interphalangeal joints and the proximal nail folds, dome-shaped, translucent, smooth surface. Type B: Mucous cysts are located below the proximal nail fold and generate pressure that creates a longitudinal depressed groove in the nail plate. Type C: Rarely, the mucus cyst extends below the nail matrix, making diagnosis difficult. Mucous cyst 7, Acquired fibrokeratoma Acquired fibrokeratoma is a kind of benign tumor of fibrous tissue, which is common in adult males, and preferably occurs in the fingers (toes), which manifests as a solitary, skin-colored, columnar or dome-shaped swelling. The most common site is below the proximal nail fold, where the tumor compresses the underlying nail matrix resulting in longitudinal grooves in the nail plate. Acquired fibrokeratoma In conclusion, benign nail tumors present some unique manifestations with some specificity because of the site of occurrence. However, when symptoms and signs are atypical, pathological examination is still needed to finally confirm the diagnosis, especially pay attention to the differentiation of malignant tumors, such as malignant melanoma, squamous cell carcinoma and so on, in order to avoid delaying the treatment.