Red or pink-tinged snot in your tissue after a good hard blow will often be a bit of a shocker. However, research by the Cleveland Clinic states that this blood-speckled hue typically indicates the presence of a few broken blood vessels inside the nose. So if you blow like a fog horn chances are you see red often after a few sturdy blows.
This is because you have ruptured blood vessels near the surface of your inner nasal passages—often close to the inside of the nostrils. Blood can also be drawn if the lining of your inner nose is too dry. So take it easy if your nose is dry or sore and blow gently to avoid any further damage. Remember, once a vessel is damaged, bleeding can recur every time the scab is dislodged with another powerful blow.