1. You can't judge FFMI by eye.
2. Gynecomastia is only a side effect if you don't cycle properly, and doesn't present in everyone.
3. Disproportionate muscle growth is an indicator of poor training habits, not steroid use. A better indicator would be disproportionately large shoulders, as shoulder muscles are more receptive to steroids (google "capped delts").
4. Acne does not present for everyone, and is only associated with some steroids, not all.
5. Roid rage is real, but it is not a reliable indication of steroid use.