The skin normally has many types of microorganisms living on it, including bacteria and fungi. Some of these are useful to the body, some produce no harm or benefits, and some may cause harmful infections. When it comes to bacteria, intact skin effectively keeps them from entering and growing within the body. However, when there is a break in the skin, bacteria can enter the body and grow, causing infections like cellulitis or carbunculosis. As for fungi, there are several causes for the creation of an environment on the skin that is favorable to the microorganisms increasing in population, causing cutaneous candidiasis. Each type of skin infection has its own causes.
Cellulitis The two most common types of bacteria that cause cellulitis are streptococcus and staphylococcus. When one of these bacteria enters the body through a cut on the skin, cellulitis can occur.
Carbunculosis Most carbuncles are caused by the bacteria staphylococcus aureus. The infection is contagious and may spread to other areas of the body or other people.
Cutaneous candidiasis Fungal infections like cutaneous candidiasis are caused by microscopic organisms (fungi) that can live on the dead tissues of the hair, nails, and outer skin layers. An infection occurs when the fungi take advantage of the warm, moist areas on the body and multiply. Fungal infections include mold-like fungi, and yeast-like fungi (such as candida). Candida is the most common cause of diaper rash in infants and the most frequent cause of vaginal yeast infections.