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Dr pen stretch marks: You can help the clients visiting your clinic for treating stretch marks now better with our professional-grade derma pens. Dr. Pen stretch is amongst the best and most effective microneedling pens available virtually now. It is an established brand. Fine microneedle tips are also available. Different categories of derma pen kits are there at drpenusa, including Dr. Pen A7, Dr. Pen A6, Dr. Pen A1, Dr. Pen X5, etc. It safely pricks the skin to boost collagen production and improve skin elasticity. It triggers new skin cell growth in the scarred skin area.