You can't cure syphilis by yourself - that takes antibiotics, and since untreated syphilis can cause a world of other problems, you shouldn't try any home remedies for that.
Fungal infections can go away on their own, or with some over the counter stuff, but Zilian is right - get it checked by a doc. Its not something you want to wait around for, ok?
AJ
Well, two possibilities:
First, as for the redness and itchness, it could be a fungus (or maybe not).
Second, as for the blisters (hands and feet), it could be sifilis.
We can't tell since we're not doctors.
What should you do? Go to the doc ASAP, okay?
Is there a cure?
Yes, you can cure yourself completely. But the longer you wait to treat it, the harder it gets.
Good luck.