Under your skin.
Under your skin.
'Under your skin' refers to something or someone that irritates you deeply, often repeating so consistently that it becomes a significant annoyance. This expression is metaphorical, alluding to the close and uncomfortable proximity of whatever is causing irritation as being as close as beneath one's skin. It invokes a sense of ongoing, nagging aggravation.
Her comments really got under his skin.
Her comments deeply irritated him.
The constant delays were getting under everyone’s skin.
The constant delays were irritating everyone.
He enjoyed teasing his sister, knowing how easily he can get under her skin.
He enjoyed teasing his sister because he knew it irritated her.