Check with your health practitioner first to make sure cyst is not cancerous
Apply comfrey root or leaf ointment
Apply a generous dab of comfrey ointment on a bandage & renew daily until the cyst bursts(within 4 to 7 days)then bandage the burst cyst with some calendula ointment or another antiseptic ointment. Reapply dressing daily until cyst is drained & healed