Final answer:
Streptococcus pyogenes can cause cellulitis, erysipelas, and necrotizing fasciitis on the skin.
Step-by-step explanation:
Streptococcus pyogenes can cause several skin infections including cellulitis, erysipelas, and necrotizing fasciitis. Cellulitis presents as a reddened and painful area of the skin, while erysipelas appears as a large, inflamed patch of skin with clear borders. Necrotizing fasciitis is a rare but potentially life-threatening condition caused by the spread of the infection to deeper tissues.