hi ,dont feel down about this ,its not what you are worrying about,i had this for a while and decided after trying to get my very scared self to the doctor ,it turned out to be a small cut ,so i was really releived .even the darker blood is not always a sign of anything seriouse,so go on your hols ,enjoy yourself ,if your still worried when you return then pop and see the doc to put your mind at rest ,take care