Last Feb. I had a lump on my neck, doctor said it was an epidermoid cyst, hot compresses made it disappear now I have another cyst next to the old one?

Epidermoid cysts. Are often found on the face, neck and back. Most epidermoid cysts either stop growing and go away on their own without treatment. Once a cyst is drained, there is a possibility that it will grow back.
Recurrence. Epidermoid cysts rarely disappear permanently without excision. Likely a recurrence of lesion. See an ENT doc or facial plastic surgeon for assessment/treatment.