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It appears you have scratched off the tops of the acne or they have just appeared as shalow crater like lesions. It could be Molluscum
contagoisum. Do you have any such lesions anywhere else in the body. The Dermatologist
would recommend Trichloroacetic acid astringent
or Cyrotherapy but after confirmation. Kindly show it to the Dermatologist. Avoid sun exposure. Wear sunscreen.