I have postpartum melasma and my skin shows slight sagging, especially around my eyes. Can melasma treatment be combined with skin rejuvenation, or should they be treated in separate stages? (Thu Huong, Vinh Phuc)

I had botox for facial slimming one month ago. Now I want to undergo high-intensity focused ultrasound (HIFU) technology for muscle lifting, but will it dissolve the botox? (Phuong Mai, 38, TP HCM)