Itchy a month after being in the sun?

I started feeling itchy on my chest, breast, and back after the first time I was at the pool for a few hours in June (I use 50 sun block but still get a bit of a tan/burn). I was at the pool a few times this summer but it’s been 3 weeks since I’ve been at the pool and I’m still itchy.

I have what looks like sores, acne, and or eczema on my breasts and upper back. (Also under my breast a bit also and they itch) Can this all be sun related? I was outside for hours last week but was in the shade most of the time and had a shirt on.