Question: I am bleeding from the back passage after passing a motion. Is th serious?
Bleeding of this nature is most commonly caused by piles. These are dilated veins that are caused by constipation and straining. When hard motions are passed, the small veins around the anus become damaged and become thin walled and swollen. Further motions can easily rupture the veins, and this leads to bleeding after going to the toilet. Sometimes the blood in the pile becomes clotted, and they may become very tender.
There are other causes for anal bleeding that include diseases as diverse as cancer and a simple tear, so it is always wise to have this problem checked and properly diagnosed by a doctor.

Question: I have a very dark red, sometimes purplish colour ring around the opening of my anus. I’m too scared to go to the doctor in case it might be cancer. I’m extremely worried I’m going to die!
There are many possible explanations for the discolouration around your anus, that vary from dermatitis, to fungal infections and piles; but the most likely explanation is that you are seeing a prominent vein that normally runs around the anus. Trying to diagnose your condition without seeing the relevant part of your anatomy, is rather like trying to play chess without being able to see the board— very difficult and liable to be wrong!
You are foolish not to consult your GP if this is worrying you so much. It is extremely unlikely to be anything serious, and your doctor can therefore give you a large dose of reassurance, and if necessary, the appropriate medication to cure the problem.
In the unlikely event that it is a significant problem, seeing your doctor sooner rather than later will make the problem far easier to cure. Embarrassment is no excuse, as both male and female doctors are readily available, and both ate very used to examining the most intimate parts of your anatomy without blushing, making sexist remarks or rude jokes.