Common symptoms include redness of the skin and a rash. You may also experience other symptoms, such as itching, pain, and tenderness. See a doctor if you have pus-filled blisters or a skin infection that doesn’t improve or gets progressively worse. Skin infections can spread beyond the skin and into the bloodstream.

Bacterial skin infections are usually caused by gram-positive strains of Staphylococcus and Streptococcus or other organisms. Common bacterial skin infections include: Cellulitis causes a painful, red infection that is usually warm to the touch.