My arm looked normal this morning but I have developed these red patches since, only on one arm. I have only been outside for brief periods (eg 10 minutes during my lunch break) whilst wearing factor 50 sunscreen.
Any ideas on what this is?
It doesn’t hurt, nor is it itchy, but it is slightly raised in areas. You can’t tell in the photo, but there are some flaky/dry skin patches too. Looks more red IRL