What is the reason for dark purple menstruation?

Patient's question:

No

Doctor's answer:

Okay, here is the translation following your instructions:
You can have an ultrasound examination to check for inflammation in the uterine adnexa. If the ultrasound results are normal, then consider issues related to blood and Qi stagnation. You can consult a TCM (Traditional Chinese Medicine) practitioner and take Motherwort (Yìmǔcǎo) and White Chicken Pill (Wūjī Báifèngwán) to regulate your condition.