hello friend, it sounds like you have gotten what we call in medical terms cellulitis
which is infection of the soft tissue
requiring antibiotics. Sometimes it will improve on its own with your natural defenses healing the wound, but if the redness
persists or spread to then you certainly need antibiotics from a physician. since your symptoms have been going on for a week now and it is still red, odds are that it will not heal on its own and it does need antibiotics. Have a great day.