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Hi there. This description would be consistent with a small hemorrhoid that clotted. Some can break open slightly and then scab over. They often first occur in the late 20s or 30s. They tend to come and go. They are far, far more common than anal cancer. They tend to improve with prep H and avoiding hard stool and straining. If it is a recurrent hemorrhoid, it can be banded or surgically removed. Ask your doctor to check it. If he or she can't treat it effectively in the office, a referral can be sent to proctology.
Yes, this is very common. Hemorrhoids are small veins. Once they become distended or enlarged, blood flow through them ceases to be laminar (linear) and the irregular flow leads to slowing and clotting. The vein can then become inflammed as well. If stool breaks it open, it can bleed.
Let me know if you have any follow up questions about any of this.