Thanks for the query.
As per your complain it seems that the symptoms of swelling of lips that subsides during the day but recur can be due to Allergic reaction
causing Allergic Angioedema
It can be due to any food or medication while other causes can be allergic reaction to any skin cosmetic, soap, lip balm etc..
I would suggest you to consult a Physician and get evaluated and a clinical evaluation and investigations like blood tests for allergies like RAST
TEST, Patch test
, Food Challenge test can help in ruling out the exact cause of the symptoms and treat accordingly.
As of now take anti allergics like Levocetrizine..
Do cool compresses over the lips .
You can be advised injectable steroids
and antihistamines to reduce swelling..
Hope this helps..