The difference between purpura and congestive rash
Disease description:
Recently, some red and purplish spots have appeared on my thigh. After searching online, some people suggested it might be purpura. It also seems possible to be a congestive rash. I would like to ask what are the differences between purpura and congestive rash?
Doctor's answer (1)
Dr. Liu Wenmin
Purpura and congestive rashes are two different types of skin lesions that have certain distinctions in medicine.
1. Causes: Purpura is usually caused by increased vascular fragility or platelet dysfunction, leading to hemorrhagic skin disorders. In contrast, congestive rashes are often caused by bacterial infection, viral infection, or allergic reactions, presenting as skin rashes.
2. Symptoms: Purpura mainly presents as petechiae and ecchymoses on the skin that do not fade upon pressure, and may be accompanied by symptoms such as nosebleeds and gum bleeding. Congestive rashes present as erythematous patches and papules on the skin, accompanied by edema and itching. Some patients may also experience systemic symptoms such as fever and headache.
3. Pathology: Purpura results from vascular wall damage or abnormalities in the blood coagulation mechanism, causing blood to leak into the skin tissues. Congestive rashes, however, are caused by vasodilation and increased vascular permeability, leading to exudation of fluid components and cells from the blood into the surrounding tissues, resulting in an inflammatory response.
