What Could Recurring Brown Vaginal Discharge During Mid-cycle Indicate?

My age is 29 years, height 5'4''.More than a year back i was diagnosed with cyst in my right ovary.But it got cured after medication.My query is that from the last six months i am observing a dark brown dried stain on the inside of my underwear in between mid of my periods, usually starts from tenth day and lasts for 4-5 days.Is it normal?