Hi there
Ouch - I hate blisters, now your dad has popped it, keep it clean, and let it have air (no plasters), to let the wound 'breath' is the best thing ..
You still have fluid coming out of it, cos it's the natural healing process of your body, the fluid is normal, and air will help it dry up.
As your Dad is a doctor, ask him more questions about it.
But keep us informed of any problems or questions you would like to ask.
Ginger