Strawberry birthmarks are abnormal blood vessels. They generally are not cancerous and depending on exactly what it is it may grow larger for a while and then get smaller. Usually they will not be harmful and the best cosmetic result is from just letting them be.
However, they are birth marks. If one gets scratched open it may bleed. Often the bleeding does not stop as soon as it normally would because the blood vessel does not contract like it normally should. About all you can do is hold pressure and wait for it to stop. If it keeps happening or is a major problem that may be a reason to try to treat it sooner rather than later and you should see your doctor. Also, if it is very large and there is other abnormal bleeding or bruising it could mean that the platelet counts are low and you should see your doctor.
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