A diagnosis of a sebaceous cyst can be determined by a physical examination of the nodule by a dermatologist, family physician or other healthcare provider. There are occasions when additional testing is required to make a definitive diagnosis of a cyst, since it can sometimes be mistaken for a different type of skin tumor.
Common tests used to diagnosis a sebaceous cyst include:
Cat scan – This test is performed to rule out other abnormalities or cancer.
Ultrasound – This test is performed to establish the contents of the cyst and depth of inflammation.
Punch biopsy – This test is performed to identify the histology of the cyst.
Culture and Sensitivity – This exam is performed to determine the type of bacteria responsible for the infection and the best antibiotic to treat the infection.
