Is it red, warm, painful, tender?
Are you diabetic?
Where on the neck is exactly situated?
How big is it?
The refilling of this is likely due to following;
1) The internal lining secretes the fluid and despite the puncture; fills it up again.
2) Communication with some very small blood vessel, which fills it.
3) The puncture done at home is inadequate to collapse it completely and inadequate drainage does not let it empty out fully.
4) Mild grade presence of infection.
A culture is usually required of the drained fluid to look for the infection. It would need a proper drainage by your doctor at office as home drainage is inadequate to empty out the full content which is essential to collapse the cavity and subsequent healing. So consulting to your primary care physician or a general surgeon would be prudent. This is a minor procedure and can be done at office.
Please feel free for your follow up questions.
You are very welcome.
This means that it has communication with an internal small vessel. These are called as hemangioma (these can vary in size) and should not be tried to drain at home. This requires a special instrument called as cautery which drains or excise it completely with stopping of the blood (by cauterizing the blood vessel).
It is pleasure and privilege assisting you.