Thanks for posting your query,
The lump you have on your tailbone could be a pilonidal cyst
. It is common for young men and the peak incidence of Pilonidal disease is between 16 and 26.
A Pilonidal cyst may remain harmless. If it becomes infected, however, it will cause pain, inflammation and usually drainage
of fluids. So I would suggest getting this evaluated by a doctor for an accurate diagnosis and appropriate management
I hope this information has been both informative and helpful
You can consult me again directly through my profile http://www.healthcaremagic.com/doctors/dr-saurabh-gupta/64132
Dr Saurabh Gupta.