How Can Severe Sun Burn On The Skin Be Treated?

Hi, After spending a few hours in the sun 2 weeks ago, I got bad patchy burn rashes on my hands, right thigh and left leg. One rash on my hand blistered and was red raw, so a walk-in clinic gave me Mupirocin which has helped. The rash seemed to spread down my thumbs over a few days, and have now mostly turned brown like a dark tan. Weird brown patches discoloration is developing between the nail and first joint in most fingers. On the same day I was burnt, I developed pretty horrendous blisters on my lips and a weird blistered rash on one side of my mouth which made me look like the movie character The Joker. This has since gone away with a cortisone cream and cold sore cream and pills. Should I be worried about my hands? It looks a little unsightly and a little scared to go back in the sun. I spent around 40 mins on the beach yesterday morning. I got very burnt on my shoulders but no other reactions this time so far than goodness, as I ve been too scared to go back out into the sun for fear of this happening again.