Four days ago, my neck began to feel really itchy and the following day I noticed a red rash - it resembles poison ivy and forms a ring like a collar around the base of my throat. The redness will usually disappear if I leave the itch alone but I can still feel welts. The itchiness is usually more severe in the mornings and evenings and I have to consciously stop myself from scratching. I haven't worn perfume/switched detergents, body wash, anything like that. About a week ago, I was bitten by a spider(?) that left three bite marks on my ankle. The bites have all but faded since then but could the two be related? I have no other apparent symptoms, no other rashes/itching/breathing problems.