Hi LD
Watch the area around the tube, it is normal for some "nasty stuff" or seepage to build up, keep it clean.
If it gets too uncomfortable, have it checked to see if it may be too tight.
I used the gravity method for mine, popped the syringe in the end and let the liquid flow in naturally. Some have trouble with this, I did not, even at 9 cans a day, plus water.