If you are someone who suffers from recurrent boils in this area then do please go and see you GP because it may be that you need a cause of antibiotics and an antibacterial wash. If this is a recurrent problem then we often prescribe a longer course of antibiotics to try and break the cycle.
This is because a giardia infection interferes with digestion and inhibits absorption of nutrients from the diet. It can also damage the lining of the intestine. In fact, this particular parasite is at the root of many cases of chronic GI inflammation in dogs and cats.
I think Duke has Giardia..... Explosive greenish, diarrhea and mucus covered, as well as not eating very well. I've been reading up on it and it appears that it is becoming resistant to Metronidazole. Besides that, I'm more of a holistic type person.