I'm not sure. The only time I had tightness and pressure behind my stoma was when food was struggling to get through. And it was right behind the stoma rather than at the tip of it - it seems odd to me that you are experiencing any sensation there at all, since the stoma itself doesn't have any feeling.
But still, if it isn't adhesions, then the muscles behind the stoma working extra hard to push food through is the only other thing I can think of.
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)