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Yesterday my mother freaked out like crazy, cus I had weird red spots on my whole neck. She told me to go to the doctor, but I really didnt want to (stubborn me). They dissapeared between 30mins & 1 hour. Now I'm literally clueless about how I got them. Could it be of an allergic reaction towards something? As far as I know I'm not allergic to anything.

Though I found out a small spider bite on my right arm today. So i'm questioning myself once again, could the red spots be caused...