Objective: To elucidate the mechanism of ultraviolet (UV) radiation on subcutaneous ecchymosis.

Conclusion Enhance the basic skills of nurses is the important method for reducing or avoiding the ecchymoma after venous-injection.

There were stagnant blood sign or grayish complexion, stagnated blood under skin, dark-purple tongue and sunken and astringent pulse in AIDS patients after observing the thousands of AIDS patients.