Itchy spots on breast

I am 17+2 today and my breast have been very itchy( just my left) but today I noticed right where my underwire is pimple like bumps which itched really bad...I’m wondering if it’s something I should take serious or if this has happened to anyone else... This is baby #5 and my milk has never came in so could it be clogged milk ducts?? FYI I did put some aquifer ointment on it tonight to see if it will help!