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 sebaceous cyst, 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. Causes
Cysts may be related to high levels of testosterone, hence may be more frequent in users of anabolic steroids.A case has been reported of a sebaceous cyst being caused by the human botfly.Hereditary causes of sebaceous cysts include Gardners syndrome and basal cell nevus syndrome. Types
Epidermoid cyst
Pilar cyst
About 90% of pilar cysts occur on the scalp, with the remaining sometimes occurring on the face, trunk, and extremities. : 1477  Pilar cysts are significantly more common in females, and a tendency to develop these cysts is often inherited in an autosomal dominant pattern. : 1477  In most cases, multiple pilar cysts appear at once. : 1477

Treatment
Sebaceous cysts generally do not require medical treatment.
Clevidipine also contains glycerin (22.5 mg/mL), purified egg yolk phospholipids (12 mg/mL), and sodium hydroxide to adjust pH. Clevidipine has a pH of 6.0–8.0
In the perioperative patient population Clevidipine produces a 4–5% reduction in systolic blood pressure within 2–4 minutes after starting a 1–2 mg/hour IV infusion. In studies up to 72 hours of continuous infusion, there was no evidence of tolerance. In most patients, full recovery of blood pressure is achieved in 5–15 minutes after the infusion is stopped. Stereochemistry
Clevidipine contains a stereocenter and consists of two enantiomers. This is a racemate, ie a 1: 1 mixture of ( R ) – and the ( S ) - form:

Dosage and administration
Aseptic technique should be used when handling Cleviprex since it contains phospholipids and can support microbial growth. Cleviprex is administered intravenously and should be titrated to achieve the desired blood pressure reduction. Blood pressure and heart rate should be monitored continually during infusion. Cleviprex is a single use product that should not be diluted and should not be administered in the same line as other medications. Once the stopper is punctured, Cleviprex should be used within 12 hours and any unused portion remaining in the vial should be discarded. Change IV lines in accordance with hospital protocol. An IV infusion at 1–2 mg/hour is recommended for initiation and should be titrated by doubling the dose every 90 seconds. As the blood pressure approaches goal, the infusion rate should be increased in smaller increments and titrated less frequently.