Which viral infection is highly contagious and presents blister-like clusters?

Herpes simplex is the correct choice because it is a viral infection that is known for being highly contagious and presents with blister-like clusters on the skin or mucous membranes. This condition typically manifests as cold sores or fever blisters around the mouth (Herpes simplex virus type 1) or can appear in the genital area (Herpes simplex virus type 2). The infection is spread through direct skin-to-skin contact, particularly when the virus is active and blisters are present.

Warts, caused by the human papillomavirus (HPV), do not form blister-like clusters and generally appear as growths or lesions on the skin. Squamous cell carcinoma and basal cell carcinoma are types of skin cancer that may present as unusual growths or changes in the skin, but they are not viral infections and are not characterized by blister-like clusters. Thus, the distinctive presentation and contagious nature of Herpes simplex make it the appropriate answer.