Close-up of an infected<unk>  located behind the ear lobe The scalp, ears, back, face, and upper arm, are common sites of<unk> s, though they may occur anywhere on the body except the palms of the hands and soles of the feet. They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst. They are smooth to the touch, vary in size, and are generally round in shape. They are generally mobile masses that can consist of: * Fibrous tissues and fluids * A fatty (keratinous) substance that resembles cottage cheese, in which case the cyst may be called "keratin cyst" - this material has a characteristic "cheesy" or foot odor smell * A somewhat viscous, serosanguineous fluid (containing purulent and bloody material) The nature of the contents of a<unk> , and of its surrounding capsule, differs depending on whether the cyst has ever been infected. With surgery, a cyst can usually be excised in its entirety. Poor surgical technique, or previous infection leading to scarring and tethering of the cyst to the surrounding tissue, may lead to rupture during excision and removal. A completely removed cyst will not recur, though if the patient has a predisposition to cyst formation, further cysts may develop in the same general area.
Sebaceous cyst
Abscess
Tornwaldt cyst
Bartholin's cyst
Dentigerous cyst
Epidermoid cyst
Trichofolliculoma
Papillary hidradenoma