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I get a red, itchy patch of skin on my neck every month. It appears the day of (or sometimes the day before) my period starts. I think this is the 4th time it's happened (period started today). Its not super uncomftable, just slightly irritated, and looks like a hickey
honestly, it's not a love bite
What could it be? I don't think it's bad enough to warrant a gp appointment but Google isn't being super helpful.
Keep a precise diary of when it appears and when it disappears, then see your GP.
It could be something like this -