Sudden red marks on the face are painless and itchy, considering that they are related to factors such as skin pressure and purpura.
1. Skin pressure: If the local skin is squeezed by external forces, it may lead to local capillary damage and subcutaneous edema, bleeding, so the patient will appear facial skin redness.
2. Purpura: mainly including allergic purpura or primary thrombocytopenic purpura, due to immune complexes deposited under the blood vessels leading to increased vascular permeability which in turn leads to increased leakage of red blood cells or their own platelet count is low affecting the body’s coagulation function, subcutaneous hemorrhage will occur, so the patient will have a painless and itchy red marks appear.
For patients with red marks on the face that are painless and itchy, it is recommended that they go to the dermatology and hematology departments of regular hospitals, and under the guidance of doctors to clarify the cause of the disease and then actively treat it.