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Mastoiditis is the result of an infection that extends to the air cells of the skull behind the ear. Specifically, it is an inflammation of the mucosal lining of the mastoid antrum and mastoid air cell system inside [1] the mastoid process. The mastoid process is the portion of the temporal bone of the skull that is behind
Each involves the external ear. The difference between them is that a cyst does not connect with the skin, but a sinus does. [3] Frequency of preauricular sinus differs depending the population: 0.1–0.9% in the US, 0.9% in the UK, and 4–10% in Asia and parts of Africa. [4]
Close-up of an infected sebaceous cyst located behind the ear lobe The scalp , ears , back , face , and upper arm , are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet. [ 4 ]
Dermatofibromas [4] are hard solitary slow-growing papules (rounded bumps) that appear in a variety of colours, usually brownish to tan. They are often elevated or pedunculated . A dermatofibroma is associated with the dimple sign ; by applying lateral pressure, there is a central depression of the dermatofibroma.
Nodules are small firm lumps usually greater than 1 cm in diameter, found in skin and other organs. [ 1 ] [ 2 ] If filled with fluid they are usually softer and referred to as cysts . [ 2 ] Smaller (less than 0.5 cm) raised soft tissue bumps may be termed papules .
The mastoid lymph nodes (retroauricular lymph nodes or posterior auricular glands) are a small group of lymph nodes, usually two in number, located just beneath the ear, on the mastoid insertion of the sternocleidomastoideus muscle, beneath the posterior auricular muscle.
A hard lump — of any shape or size — in your breast that doesn't move is the most common sign of breast cancer. It can be deep in the breast or visible on the surface. Think of it like a ...
A lump may be felt, which may feel hard if there is still bone covering the cyst, or fluctuant if the cyst has eroded through the bone surrounding it. [5] A cyst may become acutely infected, and discharge into the oral cavity via a sinus. Adjacent teeth may be loosened, tilted or even moved bodily. [6]