Hi,
I don't think that stiemycin as ointment will pass through the skin barrier in amounts possible to cause diearrhea.. However, if you apply it on the large skin area, in rare cases it may trigger some systemic effects.. In this case I think it is better to use lotion, I heard about Zineryt lotion, it has the same active ingredient as stiemycin, I mean erythromycin, but contains Zinc complex that helps to prevent bacterial resistance.. You know, a friend of mine took it and was satisfied with it...
