Sebaceous cysts are localized hypersecretion of sebaceous glands that form benign proliferations on the skin surface after mixing with bacterial infections. They generally form a sac under the skin containing tofu-dreg-like substances. Sebaceous cysts do not become malignant, and clinically, these diseases almost have no possibility of malignancy. Once discovered, it is essential to first get a diagnosis and then treatment at the dermatology department of a standard hospital. The most common treatment method is surgery to directly remove the tofu-dreg-like substances and the sac. If left untreated, the cyst may grow larger or rupture, leading to re-infection, which can be problematic.