A stoma plug is basically what it sounds like - a plug for your stoma (instead of wearing a bag). However, only those with a colostomy (usually those who irrigate) can usually use one successfully since they will know when their 'quiet times' are. For those of us with an ileostomy, they are useless since we output all the time which would push the plug out of the stoma.
Like Summerstorm, I have no problems swimming with my bag. Choose a bathing costume with a pattern or splash of colour over the stoma site which will disguise any slight bulge there. Never, in 32 years, has anyone spotted my stoma under my bathers. To gain some confidence, try soaking in a bath for 1/2 hour with your bag on to see if your bag is up to the job in the water.
I have had an ileostomy for 32 years now due to UC.
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I'm not a complete idiot - some parts of me are missing!