Why do bruises appear without being hi.t?

Vitamin C : Crucial for the production of collagen, a protein that supports bl00d vessels. A deficiency can weaken them, making them more likely to break.
Vitamin K : Essential for bl00d clotting. Low levels can cause ineffective clotting, increasing the risk of bleeding and bruising.
Coagulation disorders

Some medical conditions affect the body’s ability to clot blood properly, which can cause frequent bruising. These conditions include:

Thrombocytopenia : Decrease in the number of platelets, cells account for coagulation.
Hemophilia : Genetic disorder that prevents normal blood clotting.
Use of medications