Malassezia, tinea, and the acne mimics.
The yeast behind fungal acne cannot build its own fats, so it harvests yours. Everything useful about a 'safe list' follows from that one metabolic gap — and most safe lists get the mechanism wrong.
The average patient waits five years for the right diagnosis, then clears in about a month. Everything hard about this condition happens after that.
Three folk names, three aisles of the pharmacy, and largely one fungus — which is why the groin clears and then comes back from your own feet a fortnight later.
Those patchy pale or tan spots that surface after a sweaty summer aren't sun damage, vitiligo, or a moisturizer you missed. They're a yeast — and no brightening serum will touch them.