Hi
Epidermal cysts are benign conditions which can get infected due to various reasons.
Based on the pic it looks like it's infected.
It can cause fever, pain and Redness.
Infection is a common problem encountered in Epidermal cysts and can be managed effectively by antibiotics and surgery.
Next Steps
Consult a surgeon nearby to assess the extent and severity to decide on the probable course of management - either antibiotics first and surgery after or upfront surgery
Health Tips
Keep the area clean by washing face regularly
Do not attempt any home remedies or poking the cyst with sharp objects it only makes things worse.