Bump on forehead: Common causes and when to see a doctor

Finding a bump on your forehead can be alarming, but most bumps are benign and don't require emergency care. The cause — and the appropriate response — depends on how the bump appeared, what it looks and feels like, and whether you have other symptoms. This guide covers the most common causes and helps you decide when a bump on your forehead warrants medical attention.

Injury-related bumps: hematomas

A bump that appears after a fall or impact is typically a hematoma — a pocket of blood that collects in the soft tissue under the skin. The area may be swollen, tender, and bruised. Most minor head bumps in adults and older children are harmless and resolve on their own within 1–2 weeks. Applying ice wrapped in a cloth for 20 minutes at a time during the first 24 hours can reduce swelling.⁶ If the ice wrap produces pain, remove it for a few seconds off and on to prevent over cooling the skin and possible frostbite.

However, a head injury that involves loss of consciousness, confusion, vomiting, severe headache, or vision changes should be evaluated immediately for concussion or more serious brain injury. Do not wait to see if symptoms improve.

Sebaceous cysts

A painless, round, movable bump under the skin of the forehead is often a sebaceous (epidermal inclusion) cyst — a benign sac of keratin that develops when a hair follicle becomes blocked. Sebaceous cysts grow slowly, are usually soft-to-firm, and are almost never dangerous. Avoid trauma to the cyst as the sebum from the cyst is inflammatory if it escapes the sac, mimicking infection. They only need treatment if they become infected (red, warm, tender), inflamed or are bothersome — in those cases, a provider can drain or surgically remove them.² 

Lipomas

A lipoma is a soft, movable, painless lump of fatty tissue just beneath the skin. Lipomas can develop on the forehead and scalp and typically grow slowly over years. They're benign and rarely require treatment unless they grow large, become painful, or are cosmetically bothersome — in which case surgical removal is straightforward.⁴

Folliculitis and acne

A small, red, possibly pus-filled bump is more likely to be a pimple or folliculitis (an infected hair follicle) than anything more serious. These typically resolve with warm compresses and consistent cleansing. Recurrent or spreading folliculitis may require a short course of topical or oral antibiotics prescribed by a provider.

When to see a doctor for a bump on your forehead

Seek care if the bump:

• Appeared after a head injury with accompanying headache, confusion, vomiting, or vision changes — seek emergency care immediately
• Is hard and immovable (unlike the soft texture of a cyst or lipoma)
• Is rapidly growing or changing shape
• Becomes increasingly inflamed or painful — signs of an infected cyst
• Has persisted for more than a few weeks without a clear cause
• Has irregular borders, unusual color changes, or abnormal skin texture — features that warrant evaluation to rule out skin cancer

When to visit urgent care

Urgent care is a good first stop for a bump on the forehead that appeared after a head injury — even a mild one — especially if you want to rule out a concussion or fracture. For an unexplained growing lump, an urgent care provider can evaluate it and determine whether a specialist referral (to a dermatologist or surgeon) is appropriate. Use Solv to find urgent care near you that sees both injury-related and non-injury concerns.