About 2 months ago, i felt a sharp pain on my right foot and when i reached out to feel what it was i felt a spider at where i felt the pain. A tiny tiny spider. I didn't pay much attention to it because i didn't think it was the spider that bit me. A few days after,my foot was swollen and really painful, i used an antihistamine cream on it and massaged it. The swell reduced,but the pain has been lingering since and worse, i occasionally feel something crawling on my skin, i shake my leg to get it off when it happens but then i realised that it actually happened under my skin! What could it be? Please help.