Outbreak in London borough announced locally (4)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Aural wordplay [announced locally]:  “{H}ackney” (London Borough). Hackney is in East London where they drop their haitches don’t-yer-know, and ‘locally’ indicates that’s what’s going on here. As some of you may be eating breakfast I won’t expand on how acne = outbreak.