This LoRA produces welts such as you might find after liberal application of a riding crop's business end to someone's bottom.

Choose your poison: V4.0 produces sharply contured ones while V3.0 has them blend in a bit more.

The main trigger is crop marks. It also has a nonzero chance to give you a riding crop or maybe a hand holding riding crop looming in the picture, as well.

May have to go back and retrain this at some point to see if I can get better adherence, but for now it produces useable results that are good enough.