This is quite normal and for as long as candida keeps dying plenty. When it dies it releases a poison that is rather harsh on the entire intestinal track/lymphs. Garlic helps, indeed, but the smell is horrible. In my opinion the best way out is the hemorroid cream, `cause it will protect your anus from the irritation AND help prevent the hemoroids which usually follow the itch. Apply after each bm.
With itchy skin, zinc is also a good solution, so a itch cream (diaper rash cream) around the anus area will also help this area to counter oxydation. And the cream will come in handy, when you get the itch elsewhere on your skin. Zinc supplement is also something to consider.