I was bitten by a corn snake on February 25th. Symptoms started 2 days later, with red bloody bite site marks. A week later, blisters had been spreading in a circular fashion out from the original site on my middle finger. A week later, the spread had spread. The blisters were spreading in a circle outwards. A doctor 3 weeks later said all was well and said it was contact dermatitis and gave me hydro-cortisone cream. This increased the blisters and pain and I eventually stopped using it. I tried as an experiment to use it on other skin away from the bite mark and got no reaction whatsoever. So I am not allergic to the cream but the cream must have been doing something bad to the bite. I started taking colloidal silver (a natural antibiotic) a few days or a week before going to the doctor, since my spouse, who is African, told me I may have bacteria under the skin. I also started putting pure tea tree oil on the area of the wound, which dried the skin and blisters and seems to really help. I have found out that if I cover with the tea tree oil an area a third of an inch from the existing blister perimeter, it seems to stop the blisters spreading, or limit it to 1-2 new blisters a day. Last night, I forgot to use the tea treee oil ad this morning got up with 8 new blisters. The pattern of spreading is also now different. it is not moving out radially but sideways. What should I do?