Final answer:
Vasculitis is an inflammation of the blood vessels that can result from genetic predisposition, viral infections, sun exposure, or bacterial overgrowth, leading to skin conditions like cellulitis. Vasculitis can also cause petechiae and interfere with the lymphatic and vascular systems. Conditions such as Lyme disease demonstrate associated rashes.
Step-by-step explanation:
Vasculitis is a condition that occurs due to various potential causes. One common question is: Why do animals get Vasculitis? Possible reasons can include genetic predisposition, viral infections, excessive sun exposure, or bacterial overgrowth. For instance, inflammation of blood vessels, referred to as vasculitis, can be identified when a skin condition such as cellulitis, erysipelas, or erythema nodosum is present. These conditions are often associated with bacterial invasions like S. pyogenes post a skin barrier compromise. Additionally, viral infections that utilize the skin as a portal of entry can lead to skin manifestations, which might involve vasculitis.
Moving on to specific indicators, vasculitis can cause blood leakage from damaged vessels, resulting in the formation of purple spots known as petechiae, and it may interact with the lymphatic system, with the lymph reentering the vascular circulation at the subclavian veins. Another notable condition, Lyme disease, showcases a distinctive bull's eye-rash at the infection site.