My ears are back of neck itchy after using minoxidil liquid for 6weeks 1ml a day.

I have been using minoxdil for 6 weeks and , no side effects. During my 6th week, my ears are red and itchy and light burning sensation. My back neck and my scalp are very itchy. I don't even apply minoxidil to these areas. Are these side effects of using minoxidil? I am using 1ml liquid of minoxidil in the morning . Should i stop using it because of the side effects?