Final answer:
The red streaks on the patient's skin are likely caused by cellulitis, a bacterial skin infection. Additional tests, such as a culture and sensitivity test, should be performed to identify the bacteria and determine the appropriate treatment.
Step-by-step explanation:
The red streaks seen on the patient's skin are called linear erythema, and they are likely caused by cellulitis. Cellulitis is a bacterial skin infection that causes redness, swelling, and warmth in the affected area. It is recommended that the doctor perform additional tests, such as a culture and sensitivity test, to identify the specific bacteria causing the infection and determine the appropriate antibiotic treatment.