What the symptoms of necrotizing fasciitis?

Necrotizing fasciitis is a severe bacterial infection that spreads rapidly and destroys soft tissue. Symptoms appear quickly after an injury and may mimic other conditions, such as muscle pain or soreness. The skin can become warm, red, or purplish, with inflammation spreading fast. Advanced symptoms include fever, chills, fatigue, and vomiting.

What is the nature of the tissue affected by necrotizing fasciitis?

What later symptoms may indicate the progression of necrotizing fasciitis?