Zhang Ruifang, a 101-year-old woman in China has developed a growth on her forehead that strongly resembles a horn similar to those found on goats. The horn is approximately 6cm on the left side of her forehead. While doctors appear to be stumped, there may be a simple explanation to the horn-like feature: a cutaneous horn. The horn is made of keratin and is sometimes found in elderly individuals who are exposed to sunlight for long periods of time.
For additional information, see: Woman grows 6 cm horn on forehead