Hey there! Congratulations on your sleeve surgery! I had a similar experience, and I found that drinking a lot of water and using a gentle moisturizer helped me a lot. I also started using Vitamin E oil on my skin, and it really made a difference. Another tip is to incorporate some light exercises like yoga or to walk to keep your skin firm. You might want to check out the Cheap aesthetic clinic in Singapore, as they have great products and treatments that could help with skin issues. I'm actually planning to try them out myself! Best of luck to you on your journey!