So for the past 3 months or so I had been living out in Mexico City, and been relatively acne free apart from the old small blemish.

Since coming back home to England a couple of weeks ago my acne appears to have flared up again, horrible deep papules. No idea why this would happen when I'm suddenly back home - it certainly isn't exposure to sunlight etc helping me as I've seen more sun in England.

Any ideas what could be behind it? There's obviously something driving the breakouts here and I'd love to know what!