During a fire accident a man got blisters on his hand. Which of the following classes of burns does have blister formation?

Burns are classified by two different systems: paial thickness or full thickness burns, and first, second, or third degree burns. First-degree burns show superficial erythema with no blistering. Second-degree burns may be either superficial or deep. Superficial second-degree burns show erythema with blister formation, and they may be painful for days. Deep second-degree burns show more extensive loss of epidermis with blistering, and the skin may be dry, wet, anaesthetic, or painful and it may appear mottled. Third degree burns show full-thickness destruction of the skin and all its appendages . These burns are anaesthetic, leathery, and discolored. Ref: Color Atlas of Foot & Ankle Dermatology By Gary L. Dockery, Gary L. Dockery Mary Elizabeth Crawford, 1999, Page 280; Schwaz's Principles of Surgery, 9th edition, Chapter 8. Burns.