Is Spotting Of Bleeding After 10 Years A Cause For Concern?

I have been without a period for 10 yrs. I have been on low dose hrt patches for app. 3 yrs. I am 55 yrs old,5'1",158lbs with relatively good med hx. Irregular heart beat pro. from birth. renal stent placed in 2000. I have been experiencing new onset of vag. bleeding very light should I be concerned.