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.
Giardia infections can clear up on their own, usually within two months, but you may have intestinal problems even after the parasites are gone. Symptoms include diarrhea, nausea, gas, cramps, fatigue, weight loss, and dehydration. Stools can alternate between watery and soft, which could give the impression that the illness is clearing up. Any number of parasites or bacteria could be causing your troubles.