There are multiple causes of spotting a week after a period has ended, and not all of them are harmful, according to Mayo Clinic. Women who regularly spot between periods or experience abnormal vaginal bleeding should speak to a doctor.
Some of the innocuous causes of spotting between periods include contraceptive choices. For example, intrauterine devices, or IUDs, cause spotting between periods. It is also an early indicator of pregnancy and the perimenopausal period. Sometimes, spotting between periods arises from an underlying pathology, such as an sexually transmitted infection. It can also occur due to other reproductive pathologies, such as endometriosis. In rare cases, reproductive cancers, such as cervical cancer, cause spotting.