Bacteria such as some Staphylococcus species, Corynebacterium spp., Brevibacterium spp and Acinetobacter live on normal skin and cause no harm. Propionibacteria live in the hair follicles of adult skin and contribute to acne.

Some bacteria invade normal skin, broken skin from eczema/dermatitis or wounds (causing wound infection). Bacteria, like viruses, may also sometimes result in exanthems (rashes). The most common bacteria to cause skin infections are:

Staphylococcus aureus
Folliculitis
Furunculosis (boils) and abscesses
Impetigo (school sores)
Methicillin (meticillin) resistant Staph. aureus
Staphylococcal scalded skin syndrome
Toxic shock syndrome
Tropical pyomyositis
Botryomycosis (pyoderma vegetans)
Streptococcus pyogenes
Cellulitis
Erysipelas
Impetigo
Necrotising fasciitis
Scarlet fever
Rheumatic fever, erythema marginatum
Overgrowth of Corynebacterium spp. (erythrasma, pitted keratolysis & trichomycosis axillaris)

USMLE Step 3 Bacterial Skin Infections Algorithm with Voice explanation from USMLE Expert.
Topics:

Impetigo
Erysipelas
Cellulitis
Folliculitis
Necrotizing Fasciitis