When your phone has multiple red dots from all of your unchecked emails, pending software updates and Tinder notifications. It’s a major source of anxiety for many (especially when they view it on someone else’s phone). Ironically, this direct stress has been known to cause actual pimples.
To use in a sentence:
Salamander: Oh my god, Franthith, not to be rude but your phone has terrible acne.
Franthith: My phone?
Salamander: Yes. It has Phone Acne! But you know, if you would just check your email once in a while (or do what normal people do: just change your notification settings), the breakouts would clear right up