Take the whole beard down to the shortest length that appears in the patch, rather than trying to blend around it — a single short area is more visible than a shorter beard.
The mechanism is the same as with a haircut: correcting around a short patch widens it. And each correction is a click — a quarter or a half of a millimeter on the Braun BT9545 and BT5525 — which sounds like nothing until four of them have come off one cheek.
If the patch is at a transition — where the cheek meets the sideburn, say — it can sometimes be feathered in with a longer setting. If it is in the middle of an even area, matching the rest is the cleaner outcome.
To avoid it next time: one setting over the whole beard first, then decisions. A locking wheel prevents the commonest cause, which is the setting shifting mid-pass without being noticed — both Brauns here publish one, and what it is for is a page of its own. If the two sides came out different rather than one spot short, that is a different fault.
One thing worth separating, because the word covers two different problems. This page is about a trim that came out short in one place. A beard that is patchy because the hair does not grow there is not a tool fault and no setting fixes it — what helps is length, since growing it out lets the surrounding hair cover a thin area, and at 0.3 to 0.5 mm (0.01 to 0.02 in) a day that is weeks rather than passes.
Last reviewed August 22, 2026