I have a small lump on my left side on my neck what is it?

Blocked gland? A sebaceous cyst is a collection of oily fluid that occurs when an oil gland is blocked. Some folks are more prone to them than other and they often appear on the neck, shoulders, and back. Try to avoid skin products that are oily. I would also stay away from transfats and bad oils, which is good for overall health. Please see doctor to rule out other things. Peace & good health.