Boobs leaking for a SECOND TIME?

Ok so i tried breastfeeding...And did for about a week before we switched to formula. (had problems)

Anyways. My breasts dried up and one was still kinda leaky for a while...But then it dried up and Hasnt leaked in a while.

But now, After a very touchy feely morning with my husband, One breast (the stimulated one) Has now become Swollen and Sore and even Red. It feels like it did while they were full and engorged.

No milk has leaked yet...

But Im wondering if maybe They started producing milk again (i didnt know that was possible after they dried up) Or is this some kind of infection that i need to be checked out for.

Please Any help!

Did they restart producing milk? Is that possible?!! And how long should I wait before they can be fondled without swelling?

Sorry so many questions but i have one Swollen D boob and one squishy B boob! Im sure you could imagine!