If a dermoid cyst bursts what are the risks?

Infection: If a sebaceous cyst ruptures, there is more risk that it will become infected. Ideally, sebaceous cysts should usually be excised before they get so large that they rupture. If they get infected, they should usually be surgically drained and packed with gauze to control the infection. Antibiotics usually are needed. Surgical excision is often advisable after control of the infection.