A striking medical image has been circulating online, showing a large cyst on the back of a patient’s neck. The lesion appears raised and inflamed, with visible redness around the site, suggesting irritation or possible infection. At the center of the cyst is a keratin-filled plug — a hallmark feature of an epidermoid cyst.

Epidermoid cysts form when surface skin cells become trapped beneath the skin and begin to multiply, creating a sac that fills with keratin. While generally benign, these cysts can become swollen, painful, or infected over time. In this image, the cyst demonstrates advanced irritation, making it a clear example of why medical attention is important.

Dermatology experts caution against attempting to squeeze or puncture such cysts at home. Doing so can worsen inflammation, introduce bacteria, and increase the risk of abscess formation. The recommended treatment involves professional incision and drainage under sterile conditions, with many cases requiring surgical removal of the cyst wall to prevent recurrence.

Though some may find the appearance of the image unsettling, physicians stress that such conditions are treatable and rarely dangerous if managed properly. The photo serves as a reminder of the importance of dermatological care — and how even common skin conditions can become severe if neglected.