raise its (ugly) head

raise its (ugly) head OR rear its (ugly) head (if something unpleasant raises its ugly head, it becomes a problem that people have to deal with) — поднимать голову; (начинать) набирать силу (о нежелательном или опасном явлении)

If you say that something unpleasant or embarrassing rears its ugly head or raises its ugly head, you mean that it occurs, often after not occurring for some time.

Example 1: All over Europe, racism is rearing its ugly head once more. (CIDI)

Example 2: There was a problem which reared its ugly head about a week after she moved back in (English Collins Dictionary)