Final answer:
Raised erythematous target lesions after HHV-6 or EBV infection can be a symptom of roseola or infectious mononucleosis.
Step-by-step explanation:
Raised erythematous target lesions after Human Herpesvirus 6 (HHV-6) or Epstein-Barr virus (EBV) infection can be a symptom of several conditions, including roseola and infectious mononucleosis. Roseola is a viral infection caused by HHV-6 and is characterized by a high fever followed by a rash. Infectious mononucleosis, caused by EBV, presents with initial cold-like symptoms and a fever, followed by a macular or papular rash. Both conditions are self-limiting and require supportive treatment.