Skin issues around Neck & Chest. Any suggestions? (photos)

Hi, I would like to ask if my skin condition below consider as Keratosis pilaris? I have many lines with dirt around that area , and mild acne. Even i exfoliate 3times in a month with Chemical exfoliant and i apply 15% glycolic lotion on daily basis for the past 8months, but it doesn't work, can you please suggest what is the skin issues i am experiencing and what is are the best treatments available?

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