Herpes simplex is a viral infection caused by the herpes simplex virus (HSV). It is a highly contagious infection that can cause sores and blisters on the mouth, genitals, and other parts of the body. There are two types of herpes simplex virus: HSV-1 and HSV-2. HSV-1 typically causes cold sores or fever blisters on the mouth, while HSV-2 typically causes sores on the genitals.

Symptoms of herpes simplex can vary depending on the location of the infection, but may include small, painful blisters or sores, itching or burning sensations, fever, and swollen lymph nodes. In some cases, there may be no symptoms at all.

Diagnosis of herpes simplex is typically made through a physical exam and a laboratory test to detect the presence of the virus. The test usually involves taking a swab from a blister or sore, and then analyzing the sample in a laboratory.

Common treatment methods for herpes simplex include antiviral medications, such as acyclovir, valacyclovir, or famciclovir, which can help to reduce the frequency and severity of outbreaks. In some cases, medications may be taken daily to help reduce the risk of transmission. Topical creams or ointments may also be used to alleviate symptoms.