Raising the water temperature speeds up the life cycle of this particular parasite (Ichthyophthirius multifiliis), so that the free-swimming stage of the life cycle is reached as soon as possible. However increasing the temperature can cause further stress for the fish, as warmer water is less capable of holding dissolved oxygen.
I've never used an anti-fungal treatment to cure whitespot, and I doubt that it will have any effectiveness (unless someone can enlighten me). I would visit a good aquatic store and buy a disease-specific medication such as eSHA labs Exit or Waterlife Protozin. The entire tank must be treated to eradicate this disease.
If you need anymore advice then feel free to send me an e-mail.
To ♥life is great annaliates BYBS: I never said in any way that the Interpet whitespot treatment doesn't work (apologies if I am barking up the wrong tree), I have recommended two good quality medications that I have used in the past with good results.