So when I bought my new iPhone last week I bought these plasticky-rubbery clear covers for both the new one and the old one (pictured on the right). The woman at the shop said not to mind what looks like condensation under the case because it would eventually disappear.

But a week later it’s still there (and I assume on my new one too but I can’t see it as it’s pale grey at the back).

My question is… is this bad for the phone? Being damp all the time? I’ve wiped both surfaces several times until they feel totally dry but as soon as I put the cover on I get this again. Or maybe this happens with all covers but I’ve never noticed before because they aren’t see through?

Help?