Fingernail flower is also known as anemone flower, dyed finger flower and small peach blossom. The nail flower is a famous traditional Chinese medicine that has the effect of invigorating blood circulation, dispelling wind and dampness, detoxifying for external use, and has a strong antibacterial and anti-allergic effect. The nail lesion is caused by dermatophytes invading the nail plate and under the nail, and from the Chinese medicine point of view, the two have a mutually exclusive principle of action, so henna is effective in treating gray nails. The patient can soak the affected nail with warm water for 5 minutes, then mash the henna flowers, soak them in glacial acetic acid or rice vinegar and apply them externally on the gray nail, then wrap the gray nail with gauze or band-aids and insist on daily medication changes, and try to scrape the brittle part of the diseased nail with a knife before changing the medication, but do not injure the healthy part or cause bleeding, etc. to avoid infection. During the treatment period, you should stop any other treatment and observe the effect after a period of time. At this time, it is necessary to strengthen the diet to replenish the nutrients needed for nail growth, so as to speed up the healing of the diseased nails and promote the growth of new nails, and the gray nails will gradually heal. However, it is important to note that gray nails are prone to recurrence and Chinese medicine is usually slow to work. For more severe and recurring gray nails, antifungal medications such as terbinafine ointment should also be actively used for treatment.