Well you cant change a dermal anchor, hence the phrase "dermal anchor". The dermal anchor is permanent (till the body rejects it) and cant be changed, however depending on the design of the anchor some have removable screw tops that can be changed leaving the anchor in place. Changing the top too soon can cause bleeding and possible infection of the anchor. Best to wait at least two weeks (14 days) before attempting to change the top yourself, if you run into trouble go back and see your body modest for assistance.
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