Forehead Bump: Common Causes, Symptoms, and When to See a Doctor

A sore, unexplained bump on the forehead can arise from various conditions. While many are benign, some require medical evaluation. Below are the most common causes.

1. Sebaceous Cyst

A blocked oil gland forms a smooth, round lump under the skin. Usually painless, but can become tender or infected.

2. Lipoma

A soft, movable, fatty tumor that grows slowly. Typically painless unless it presses on nerves or grows large.

3. Hematoma

A collection of blood from recent trauma, even minor. Often tender, bruised, and may feel firm.

4. Abscess

A localized bacterial infection causing a painful, red, warm lump, possibly with pus drainage and fever.

5. Skin Tag

A small, soft, flesh-colored growth attached by a thin stalk. Usually asymptomatic but can snag on clothing.

6. Insect Bite or Sting

Sudden onset of an itchy, red, swollen bump, often with a central puncture mark.

7. Allergic Reaction

Hives or localized swelling triggered by contact with an allergen (e.g., cosmetics, hair products). May include itching, redness, or systemic symptoms.

When to Seek Medical Attention

• Rapid growth or change in appearance
• Persistent pain, redness, or warmth
• Fever or signs of infection
• History of skin cancer or immunosuppression
• Uncertainty about the cause

A healthcare provider can diagnose the bump through examination, and if needed, imaging or biopsy, and recommend appropriate treatment.