What could a lump on your neck about an inch under your ear be that occasionally enlarges but then goes down to its smaller size and you've had it for about a year and it doesn't hurt?
That certainly sounds like a lymph gland (node)... They can act
exactly like that... The other possibility is that it could be a
sebaceous cyst... Since you didn't mention it ever drained pus,
it's probably a lymph node... both are extremely common in that
part of the body...