Whether an epidermal cyst is cancerous without cutting cannot be generalized and should be judged according to the specific condition. Epidermal cyst is a benign lesion and not a serious disease. If epidermal cysts are hidden, small in size and without obvious uncomfortable symptoms, they usually will not become cancerous. For epidermal cysts with repeated infections and ruptures, surgical excision is recommended, because repeated infections can form chronic inflammation locally, leading to adhesions between cysts and surrounding tissues, local skin unevenness or scarring, increasing the difficulty of later treatment. Due to repeated infection stimulation, there is a possibility of cancerous changes. For patients with surgical removal of epidermoid cysts, they must be removed completely to reduce the chance of recurrence after surgery and change medication on time to avoid wound infection.