Acquired coccygeal nodule due to repeated stimulation by a bicycle saddle

J Dermatol. 1995 May;22(5):365-9. doi: 10.1111/j.1346-8138.1995.tb03406.x.


Four Japanese male students, aged 14, 16, 18 and 19, were found to have a nodule in their coccygeal regions. The typical lesion was a rugby-ball-shaped, normal-colored or slightly erythematous nodule measuring 5 to 6 cm in its long axis. Histopathologically, it showed hyperplasia of collagen fibers and slight acanthosis. All four students rode to school by bicycle over long distances and long periods; three of them developed the nodule after they started bicycle riding to school. We found that the nodule shape corresponded to the saddle of the bicycle. X-ray abnormalities included bending or anterior dislocation of the coccyx in all cases and spina bifida in two cases. These nodules may have developed as a result of irritation of this region by the saddle of the bicycle.

Publication types

  • Case Reports
  • Review

MeSH terms

  • Adolescent
  • Adult
  • Bicycling*
  • Child
  • Coccyx* / diagnostic imaging
  • Coccyx* / injuries
  • Cumulative Trauma Disorders* / complications
  • Female
  • Humans
  • Male
  • Radiography
  • Skin Diseases / diagnosis
  • Skin Diseases / etiology*
  • Skin Diseases / surgery
  • Spinal Dysraphism / complications
  • Spinal Dysraphism / diagnostic imaging