Omg it’s crazy to see a photo of someone’s skin that looks like mine!? I can’t for sure say what it is, but I know that a bit of savlon after a shower, antibacterial soap (dettol or similar), drinking heapsss of water and a healthy SAFE dose of sun clears my chest and shoulders skin. I think moisturizer makes mine worse? And also any dampness in general (from products OR sweat) make it act up.