A slight leakage seems normal and many UM users experience that phenomenon. Normally that leak seals itself when the PLA degrades. Then it becomes dark or even black (unless you're already printing black PLA haha) and it gets hard and brittle sealing that tiny leak.
Nevertheless a photo would be nice so we can guess how strong that leakage is.
If you have some photos of your hot-end, it might help us identify any obvious problems.
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