The evaluation of a cyst begins with a medical history and physical examination.
The diagnosis of a skin cyst is usually made during physical examination.
An ultrasound examination may be required, in order to determine the exact size and location of a large or deep skin cyst.
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- Kwittken J. Sebaceous cyst: fact, not fiction. Int J Dermatol. 1994 Mar;33(3):218-9. 
- Nakamura M. Treating a sebaceous cyst: an incisional technique. Aesthetic Plast Surg. 2001 Jan-Feb;25(1):52-6. 
- Thaller SR, Bauer BS. Cysts and cyst-like lesions of the skin and subcutaneous tissue. Clin Plast Surg. 1987 Apr;14(2):327-40.