A subcutaneous bursa overlying the frontal bone, developing between the galea aponeurotica and the periosteum in response to repeated trauma or pressure. It is most common over the glabella and supraorbital ridge in individuals who frequently wear tight headwear or helmets.
Subcutaneous frontal bursitis presents as a soft, painless or mildly tender swelling over the forehead, occasionally confused with a sebaceous cyst or lipoma. Infection of a frontal bursa can spread to the subgaleal space, producing a dangerous scalp infection. Ultrasound confirms the thin-walled, fluid-filled nature of the lesion.
Bursal swelling over the frontal bone from helmet pressure or repeated forehead trauma, presenting as a fluctuant, painless lump that transilluminates and is confirmed by ultrasound.
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