I scratch my boobs a lot and now there's like open wounds on my areola and around my nipple?

Scratched the skin: You have scratched the skin off. You can use an antibiotic cream after bath with soap and water to keep it clean to prevent it getting infected. But you need to take some med to stop the itching like Benadryl (diphenhydramine) over the counter.And it may be a good idea to see your doctor or a dermatologist to find out the cause of itching and to stop scratching as it can happen again