Skin infections are common and may be caused by bacteria, fungi or viruses. 
Breaks in the skin integrity, particularly those that inoculate pathogens into 
the dermis, frequently cause or exacerbate skin infections. Bacterial skin 
infections caused by corynebacteria include erythrasma, trichomycosis axillaris 
and pitted keratolysis. Staphylococci may cause impetigo, ecthyma and 
folliculitis. Streptococcal skin infections include impetigo and erysipelas. 
Human papillomavirus skin infections present as several different types of 
warts, depending on the surface infected and its relative moisture, and the 
patterns of pressure. The many dermatomycoses (skin infections caused by fungi 
or yeasts) include tinea capitis, tinea barbae, tinea cruris, tinea manus, tinea 
pedis and tinea unguium (onychomycosis). Candidal infections occur in moist 
areas, such as the vulva, mouth, penis, skinfolds and diaper area. Wounds caused 
by wood splinters or thorns may result in sporotrichosis. Animal bites may 
result in complex, serious infections, requiring tetanus and, possibly, rabies 
prophylaxis in addition to appropriate antibiotic therapy.