3-4 weeks ago I was bitten by something on the top of my foot. The "bite" was your typical circular bite. the bite today have developed into a snake shaped rashor a river-like rash. It spans almost three inches and it weaves itself just like a river or a snake. It itches insatiably. I have been putting 2.5% cortizone for the last two days but concern that it is growing. Can you give me some posible cuases that I can research further.

Thanks