This article describes a case of giant cell tumor (GCT) of bones at the distal phalanx of the left thumb in a 74 year old male patient who showed pain and swelling in the left thumb. The article discusses the diagnosis, treatment and prognosis of GCT. GCT is usually not reported in adults over the age of 55 and is mostly seen at the end of the long bones, but this case involves the GCT at finger bones. The patient also had previous history of having skin cancer. Although researches showed that there is no significant difference between the GCT of young and older individuals, GCT of hand bones have been reported to be much more aggressive in nature rather than the GCT occurring at any other position.