Well, *someone* should take them out (at the proper time when the cut is healed, of course). Why would you not want to? My vet always does the stitches removal as part of the cost of the first appointment, so we just drop in about ten days later and he takes them out and the office call is free. Why not have the vet take them out?
The reason we don't leave stitches in after the skin is healed is that either the skin will grow over them (but not on an ear) and it will be a foreign object in the skin, or they might get infected, or simply could get snagged on things. The skin itself, even with a scar, is smooth, pliable, living tissue. Having something embedded in it that is not smooth or living, is asking for future problems.
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