Here's a hard fact of life that nobody at a beauty counter is ever going to tell you about: Some skin issues just happen, regardless of how diligently you cleanse, tone, serum, and moisturise. There are factors beyond our control (thanks, genetics!) or, perhaps, beyond our scope of knowledge, that can cause difficult-to-treat things like melasma and cystic acne.
Here's the good news: Even though we can't prevent the natural from occurring, we can treat it. Your remedy could be as simple as regular facials and a stricter at-home regimen, or it could get slightly more, well, involved.