Boob question! On the Areioa..

Im embarrassed to ask so i am asking anonymously! But on that area of the boob mine is kind of bumpy, (mainly when nipples are hard) and from time to time i find the bumps appear with a white head so i squeeze an a little (im guessing bra dirt) comes out! Am i the only one??? Please tell me im not!  My paps are always great! No infections, no cancer knots just weird pimple like bumps from time to time on my areioa!! 
I wash my bras usually weekly so im guessing it can be build up ! But am i abnormal? 
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THANK YOU LADIES! I thought it ws just me ive ben wanting to ask someone for a few years but didnt know how!