Final answer:
Cutaneous vasculitis refers to the localized inflammation of the dermis and hypodermis caused by the formation of immune complexes and their deposition in the tissues and blood vessels. It can be caused by streptococcal infections and other pathogens, leading to symptoms like redness, warmth, and pain. Treatment plays a crucial role in managing the condition and preventing complications.
Step-by-step explanation:
Cutaneous vasculitis refers to the localized inflammation of the dermis and hypodermis, which can result in symptoms such as redness, warmth, and pain in the affected area. It is a type III hypersensitivity inflammatory reaction caused by the formation of immune complexes and their deposition in the tissues and blood vessels. This condition can be caused by various factors, including streptococcal infections and other pathogens.
For example, S. pyogenes, a type of streptococcus, can cause cellulitis, erysipelas, and erythema nodosum, which are all forms of cutaneous vasculitis. Cellulitis presents as a painful, red rash on the skin, while erysipelas is an inflamed, swollen patch usually on the face. Erythema nodosum is characterized by small red nodules, commonly found on the shins.
Other causes of cutaneous vasculitis include conditions like contact dermatitis and delayed-type hypersensitivity reactions. It is important to diagnose and treat this condition appropriately to prevent complications and manage symptoms.