Can you get the flesh eating bacteria through a scab? i'm planning a beach trip next week but i have many scabs from mosquito bites.

Not likely: People have been swimming with scabs forever. Obviously don't pick at them, they are there to protect you while your body heals. Furthermore, ocean water is not likely to harbor flesh eating bacteria. And do take mosquito repellant! Can't be too careful nowadays as mosquito borne illnesses are far more common than Flesh eating infections.