I looked in my tank and noticed Mindy my Lionhead has Ick!!! Why would only one fish have it and not the others? She even had little red dots on her face to go along with it. What could that be? All the other fish are doing great. I put her in the hospital tank as soon as I saw it.

could you please answer all of the q's in the white box at the top

Assuming it is Ick, I would say most likely all your fish have it, just that the first one to get noticably sick is the weakest (most sick). As Dan mentioned, checking water params would be a great start to why it is happening.

mkinga is very right. Ich is aparasite that has several stages of life.

The stage where the parasite buries itself under the fish's skin and multiplies is the only stage that we can see with our bare eyes. When the parasites are buried under the skin, the skin stretches tightly over them - making it look like a white pimple on the fish.

When they are ready, the pimple will burst and all the small, "larvae" or non-adult parasites will drop to the bottom of the tank. There, they can encapsulate and wait for months/years until the time is right - a stressed fish, cold water or bad water stressing the tank's occupants.

They can also hatch out into what are called "swarmers" - tiny microscopic sized parasites that are free swimming. They attack the fish in that stage - doing much damage without you seeing it at all.

It is even possible for a fish to die of an ich infestation without you ever even seeing the tell-tale white spots.

If even one of your fish in a tank is showing the white spots, you need to assume that ALL the fish are compromised and treat the tank as such. Isolating Mindy may help her - but it will not clean the main tank of ich. You need to treat it all. Salt is a wonderful and effective treatment.