Is it normal too have blackheads on your breast(s)?

I am a female, in my twenties and I get a good amount of blackheads on my breast. I shower everyday and am a very clean person, which is weird because I dont have blackheads anywhere else! I googled too see if this was normal, I found old topics where a lot of women said they had it but no idea why they had it! So is this normal? Does anyone else have these?!