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Dr. Rassman wrote: In general, pimples after surgery can be common and they can persist for many months, reflecting the production of sebum under the skin from the sebaceous gland that was part of the follicular unit. In some patients, until there is hair growth the sebum collects in small pockets (unable to escape along the non-yet-existent hair shaft). We often drain them with a simple, sterile needle in the office. Transplanted hairs usually grow despite these pimples.