skin infection where lipoma site is.

I have a 3 inch cookie shaped lipoma on the back of my arm right above my elbow. When the lipoma first appeared the skin around it was stretched tight and itched alot and I didn't think anything about scratching it too much. Later I applied creams for the itching but it was too late by then. I started with what looked like scabby blisters that spread all over where I had scratched. I have been to the doctors and they don't know what it is but gave me clindamycin  to take. I was only able to take the clindamycin for 2 days before I had an adverse reaction where the lymph nodes in my neck swelled up to golf ball size. My doctor is unsure what the rash is because it looks similar to impetigo because it is blisters that crust over but its clear and not discolored, yellow crusty looking. I have a referral to go to the dermatologist but I don't have the money to go yet.