My skin got clear after I spent a week exposing it to the sun. [B&A] [Selfie]

Hi everyone! - pic 1 was how bad my stubborn back acne was. I tried everything and nothing worked for me. I went on a 7 day holiday in an island so I was pretty much exposed to the sun all day, swimming all day at the beach. I got a mild sunburn and have a tan now. I noticed my back got very clear after this, my skin even feels softer. I don’t know if this means I had some sort of vitamin D deficiency since I didn’t went outside much, I really don’t like the sun or to tan. It just happened in my vacation and now I have a clear back! - i’m a bit worried it might come back once my tan starts to fade - so idk if i should start taking vitamin D supplements since i really dont want to continue exposing myself to the sun (got a new freckles here and there due to it, so wanna avoid that)

I’m pretty happy about how my back is looking though.