There are a wide variety of scalp infections that can cause severe hair loss. Fortunately, most scalp infections can be treated successfully and have a significant effect on the hair growth. The main causes of scalp infections are bacteria, fungus, viruses, or parasites. Folliculitis is a bacterial infection that affects a large area of the scalp. If the infection is deep in the hair follicles the damage may cause a more extensive treatment but if caught in time and treated it will heal quickly. An example of fungal infection is Tinea Capits, which is caused by viral and parasitic folliculitis. Generally, it affects other hair growing areas such as the body, beard, eyebrows, and eyelashes. Piedra is another very common scalp infection that affects both curly and straight hair. It can lead to the formation of nodules on the infected hair, however with careful examination of these scalp infections, treatment can solve the hair loss.