Phenol ear drops are commonly used in clinical practice and act in several ways. The first one is to soften the embolized cerumen by softening it and then sucking it out by suction, or flushing it out with saline. The second, phenol, has a cautery effect, and has an anti-inflammatory effect on acute osteochondritis. Phenol, which has a cautery effect, has a significant effect on pain in the early stages of sexual tympanitis and acute otitis media, with anti-inflammatory and analgesic effects. However, the clinical application of phenol ear drops is also contraindicated because of its cautery effect, so it should not be used after the tympanic membrane has been perforated. Because it enters the middle ear tympanic chamber, it has the effect of cauterizing the mucous membrane of the middle ear tympanic chamber, causing congestion and edema of the middle ear mucous membrane tympanic chamber, and even the effect of mucous membrane scarring, so it can no longer be used.