Bloom effect around a GUI texture

Hi, I have a health bar at the top of the screen that goes up and down depending on the health of the player. GUI.DrawTexture(Rect(Screen.width / 2 - 150, Screen.height - Screen.height + 30, adjust, 15), playersHealthTexture); adjust is a variable held in a GlobalVars.js What I'd like to do is when health is added I'd like to add an effect like a bloom around the GUI area popping in then fading out, can someone point me in the right direction to achieve this please, cheers.