It very well could be absolutely nothing but, any abnormal discharge or bleeding no matter how slight, after menopause is deemed to need checking just to be on the safe side.
Three years with no periods is definitely post menopausal but, that doesn't mean that our hormones have completely settled down and can still have a surge that can create some spotting temporarily and be perfectly normal. However, again, only a doctor can determine this and best to be safe than sorry. Likely an ultrasound (painless) can determine the thickness of your uterine wall/endometrium. If it is thin (4 mm or lower), there is likely no cause to worry. More often than not, post menopausal disturbances like this are due to vaginal atrophy meaning the vaginal walls become thinned and dry and can cause bits of spotting/bleeding through irritation. In that case, vaginal creams can be used as well as over the counter lubricants to keep it from bleeding and becoming too dried to cause cracking/tears.
I'm assuming that you've had your PAP's and they are coming back as normal?
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