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Contradicory use of Corticoids on canker sores?

I've read that steroids should not be used in case of ulcers, it may exacerbate the problem. However, corticosteroids are used for treating aphthous stomatitis (triamcinolone), which are a type of ulcer. How to explain this seemingly contradictory situation?
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replied November 23rd, 2014
Thank you for asking

They are used topcally to prevent inflammation of aphthous ulcer and thus relieve pain. Steroids at stomach level systemically causes prostaglandins inhibition which maintain epithelial integrity thus causing this ulceration. Should be avoided or supplemented with PPi.

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