Take redness. It sounds straightforward but clinically it is anything but. Redness can be telangiectasia, rosacea, active inflammation, contact irritation, hypersensitivity or a compromised skin barrier. Each of those has a different cause, a different pathway and a completely different treatment approach. If you treat rosacea the way you would treat inflammation, or the other way around, you do not just get a poor result. You can make the condition significantly worse.
Brown spots follow the same logic. A spot that looks like sun damage might be melasma or seborrheic keratosis. Those three conditions respond very differently to treatment. Melasma in particular can be aggravated by certain light-based and heat-generating treatments that would be entirely appropriate for sun damage. The symptom looks the same. The pathology underneath is not.






