hello! usually its caused by friction! kunwari you're wearing jeans tapos dala mo si tote bag, when the surfaces rub against each other kaya may nafoform na himulmol. if you check the thank you card may care instructions sa likod on how to remove lint. you can buy an electronic lint remover sa orange app (not sponsored). super useful din siya with other stuff na may himulmol. 😁 hope this answers your question!