A 20-year-old woman, who presents to the sexual health clinic, is concerned because approximately 7 days following intercourse with a new partner, several painful genital lesions appeared. Before the lesions appeared, she states that she had a "cold" and fever. She describes them as looking like a "blister" and notes that some have ruptured and crusted over. She is worried that her partner may have given her a sexually transmitted infection (STI) and is expressing feelings of anger. Based on the patient's presentation, which potential condition should the nurse suspect?