There is an infection in Pisces'body.. it need to be driven away.
Did you get that from the horary chart? What would indicate that?
Or are you just going by the knowledge of what cystic acne is?
Being a first year herbalism student, I've been going through my books and class notes to see what I can find on acne, particularly the cystic kind. My knowledge is very general at this point, I'm not qualified to give medical advice, but some general information about it from an herbalism perspective:
Acne is not a disease in and of itself, it's a symptom, of sluggishness in the system. Hormones out of balance, blood not clearing toxins fast enough, possibly some liver and/or endocrine sluggishness. Lymphatic system overload is almost always a factor. If you have acne along your jawline and cheeks, that's a pretty sure sign of it being the lymphatic system.
Herbal treatments for acne would be herbs that support the liver (hepatics), that cleanse the blood (alteratives), and that cleanse the lymph system (another class of alteratives). Something to balance hormones would probably help, too, especially if you've been on birth control--that would result in the hormones needing to be rebalanced. If you're currently on birth control, however, the hormone balancing herbs would not be the thing to take because of interactions.
I can't tell you what to take, but I have whole lists of herbs in my notes that fit those categories. For hormone balancing, I would definitely start with vitex. It's an intelligent herb, in that it will automatically figure out which hormones are low and which are excessive and balance them out. Do not take it if you're currently on birth control. If you are not, it's perfectly safe.
For alteratives (blood and lymph cleansers), my list says nettles, dandelion, cleavers, chickweed, burdock. Cleavers and chickweed are lymph cleansers in particular. Nettles are a blood cleanser. Drinking nettle teas/infusions is often one of the first things recommended in herbal treatment, because nettles provide a good support for everything else, and they can do no harm. Burdock roots make a good stew ingredient, if you can get them.
There are particular forms of massage therapy that work on the lymph system in particular. If you can find someone who does that, it would be helpful.
I can't say what will work for you, but those are some ideas that would work on the disease instead of just the symptom.