@medicchristy -- There are so many different stories about the Aswangs and different Aswang sightings. I read an article by Micha Lindemans that says that the most common Aswangs are the female variety. She says they appear looking like an ugly old woman with long, tangled hair, long nails, blood-shot eyes, and a long, black tongue.
It is also said by some that the Aswang can be revealed by using special oil made of coconut and other plant parts. Supposedly, special prayers are said and when an Aswang comes near the house at night, the oil with start to boil and keep boiling until the Aswang leaves the area.