thanks for query
From your post I can see that you are using Depo for long time. It has some side effects as other medicines.
As for your knowledge,depo may cause side effects such as amenorrhea
, irregular bleeding, spotting, and heavy bleeding. Vaginal cysts, dyspareunia
, and changes in cervical erosion and secretions have also been reported.
Brown blood may be because of that but if abnormal bleeding persists or is severe, the possibility of an organic pathology should be considered and ruled out i.e go gynae eamination.
And if you have completed family consider Tubectomy
I hope this will help