Re: spider bite?
Hi Ms._Rican. It is important to get photos of this reaction. Place something near it, like a coin or ruler, before photographing to give it size defintion. This is important documenation that may be needed later.
It could be a spider bite or a tick bite. Make sure the black mark is not a bug, although if it was hopefully the doctor would have seen it.
It if is a tick bite, he needs to get treated with antibitoics as soon as possible. Lyme disease is a multi-system bacterial infection caused from the bite of an infected tick. Although only about 50% of people who have Lyme disease ever get a bulls-eye rash, it is a definite sign of Lyme.
If you think Lyme disease is a possibility, it is very important to see a knowledgaeble doctor. Many doctors do not understand tick-borne illnesses. No test is completely reliable, and results can vary by lab. Besides Lyme disease, ticks can transmit several other co-infections.
If you would like a Lyme doctor recommendation for your area, let me know.
I hope your boyfriend feels better soon.