Corolla Headlight Lens burned?

The only thing I can think of is that perhaps the headlight covers (clear plastic) were wiped to clean them with a chemical that attacked the plastic and when heat was applied to the underside acted as a catalyst to "bubble" the cover. I would not outright accuse them, but ask if anyone at the shop wiped them, and if so, with what? Some carburetor and electrical cleaners are extremely powerful and may attack the plastic if it comes into contact. Normally there should be no problem with the use of either high or low beams damaging the clear cover.

Thanks, I will ask about that. It is just so odd that it is just over the high beam area of both headlights when I rarely even use the highbeams.

Are the high beams still the original bulbs also?

Come to think of it, it would seem unlikely that if heat was the reason that they would bubble outward.

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I've only ever seen this with cars that had high wattage bulbs fitted - whip one out and check its rating. For this reason I only use 100/130W bulbs (and rewire if needed) on cars with glass lenses, unfortunately sometimes other people don't realise this.

Nah, I had this happen when I replaced the front parking lights in my '80 Corolla with the wrong size. Nice bubble right in the middle of the lens!