In talking to a friend whose house i was over when he got EC one thing that we did realize we that was similiar is we both went to the dentist where our lips stretched by plastic holders to keep the mouth open.
This kind of trauma, or trauma associated with biting the lips or clenching them tight or pulling on them could be a factor. Never pull pinch or bite the lips.
In my previous post I mentioned macrolide antiboitics.
He was sick and doctor gave him antbitoics plus he had a high fever , vomiting and was stressed.
Its important to narrow down potential causes so we don't make things worse.
Here are my observations:
1. trauma to lips
2. Antibiotics such as macrolides
3. stress
4. high fever and viral infection
5. not eating nutritiously - fasting /under weight.
6. poor oral hygine.