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Do Cosmetic Lasers Penetrate Through the Dermis? Isn't This Where Second Degree Burns Occur?

I'm reading that lasers don't go that deep, yet sebaceous glands, hair follicles, etc...are located in the dermis level. According to burn centers, heat generated that penetrates into the dermis will cause a 2nd to 3 degree burn, blistering does not need to be present. In addition, according to burn centers, the dermis does not regenerate when it is affected, leading to dry leathery burnt skin and scars developing any where from 1 month after treatment to on year. What makes lasers safe?

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