What is a Big bump on the scalp?

A big bump on the scalp can be caused by a variety of factors, including:

- Skin conditions: Cysts, lipoma (a fatty tumor), trichoepitheliomas (benign tumors of hair follicles), and pilomatrixomas (non-cancerous growths of hair cells) can all cause bumps on the scalp.

- Trauma: A blow to the head can cause a bump or hematoma (collection of blood under the skin).

- Infection: Bacterial, fungal, and viral infections can all cause bumps on the scalp. Common infections include folliculitis (infection of a hair follicle), carbuncles (clusters of boils), and tinea capitis (ringworm of the scalp).

- Cancer: Skin cancer, such as basal cell carcinoma and squamous cell carcinoma, can also cause bumps on the scalp.

It is important to see a doctor if you have a big bump on your scalp, especially if it is painful, changing in size or appearance, or accompanied by other symptoms such as fever or headache. The doctor can diagnose the cause of the bump and recommend appropriate treatment.