What are sepsis sores like?

Varies. Depending on the type of infection causing the sepsis syndrome, the skin sores vary. Blisters, areas of skin death (necrosis), deep ulcers, raised/hard areas all occur.
Depends. Skin lesions in sepsis vary depending on the causative agent. For instance in infection related to raw shellfish (called vibrio) the skin lesion is blue/purple and forms large blisters. In an infection from meningococcus (a bacteria) the sores are raised, palpable and purple (so called purpura fulminans). Many other skin lesions can be seen in sepsis it just depends on what causes it.