I hit my forehead and got a big bump—why are my eyes turning purple and blue?

When a bump on the forehead causes bruising and discoloration around the eyes, it is usually due to a subcutaneous hematoma on the forehead that spreads to the outer area of the eyelids, resulting in periorbital ecchymosis (black eye). This typically indicates the diffusion of accumulated blood.

Patients with a forehead bump accompanied by eye bruising can apply warm compresses using a warm towel, hot water bottle, heated salt bag, or gently rolling a warmed egg over the affected area. These methods help improve local blood circulation and promote the absorption of the bruise. Patients should also ensure adequate rest, avoid strenuous physical activity, maintain good personal hygiene, refrain from rubbing their eyes or other harmful habits, eat light, easily digestible, and nutritious foods, and avoid greasy, spicy, or irritating foods as well as smoking and alcohol. When applying heat, care must be taken because the skin around the eyes is delicate and prone to burns; therefore, the temperature should not be too high. If warm compresses are ineffective, patients may, under medical supervision, take traditional Chinese medicines that promote blood circulation, remove blood stasis, reduce swelling, and relieve pain—such as Sanqi Shang Yao Pian (Notoginseng Tablets), Danqi Capsules, or Shangke Die Da Capsules.

In addition, if the injury causing the forehead bump and eye bruising occurred less than 24 hours ago, cold compresses are recommended to minimize bleeding and swelling, which aids recovery. If more than 24 hours have passed or symptoms worsen, medical evaluation is advised.