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Increase in the level of collagen in response to skin microneedling therapy for post-acne atrophic scars. Immunohistochemical staining of skin tissues at baseline, one month after treatment, and three months after starting microneedling treatment for collagen type I (1st row), collagen type III (2nd row), and collagen type VII (3rd row), compared to baseline (IP “1st and 2nd rows” and IF “3rd row” staining; x200)
