Sorry, the "ill" should read : These "will" go big and shrink .....
As you have had your anus checked out by the doctor, you don't have anything to worry about.
What the growths are likely to be are haemorrhoids. These ill go big and shrink down and sometimes will show as some blood on the paper.
Make sure that you have a good healthy and balanced diet with lots of fresh fruit and vegetables. Lots of fluids. 2 litres of water a day is usually recommended, more if you sweat a lot. Having some form of exercise will also help with bowel movements.
Cut out or cut down on sugary and junk foods, processed foods and fizzy drinks. Eating more fibre and drinking enough fluids will help so that you do not get constipated and strain when you go to empty your bowels. When you strain to go to empty your bowels that does aggravate the veins in the anus (also if you have lots of diarrhea), and then they "flare" up.
You can purchase medications from the pharmacy for relief of haemorrhoid discomfort. The little "stalky thing" looks like it is a skin tag and if it does bother you, you can ask the doctor to remove it.