It may be caused by many things, including insect bites, allergic reactions, medication side effects, fungal skin infection, bacterial skin infection, infectious disease, or autoimmune disease.
What is infectious disease?
Infections are defined as the invasion of tissues by pathogens, their proliferation, and the host tissues' reaction to the infectious agent and the toxins they release. An infectious disease, also known as a transmissible disease or communicable disease, is a sickness that is brought on by an infection.
Although there are other pathogens that can cause infections, viruses and bacteria are by far the most prevalent. The immune systems of hosts can aid them in fending off diseases. Mammalian hosts undergo an innate response, which commonly involves inflammation, in response to infections, followed by an adaptive response.
Among the particular medications used to treat infections include antibiotics, antiviral, antifungal, and antihelminthic medications. In 2013, 9.2 million persons, or 17% of all deaths, were caused by infectious diseases.
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