Small lump in buttock

Hey, I'm not really sure if it's right to post here but couldn't find anything online. 
I found a hard lump deep in my left buttock about 2 weeks ago. It is slightly bigger than a pea and hasn't changed in size over the last 2 weeks. It is not painful and doesn't moved when pushed. 
 

should this be something I speak to the doctor about? It's not causing any problems.