So I was steaming my clothes when a drop of hot water droped on my leg and then the skin was showing, the next day there as a burn blister?

Burn. Yes, this sounds like a superficial partial-thickness burn. Should heal just fine.
See below. The best thing is to leave it alone, protect it with a bandage and let it heal naturally.
Aloe vera if not inf. As long as their are no open lesions over the burn site, applying pure aloe vera will help the area heal faster. If the area is red or if the blister is open then applying silvadene (silver sulfadiazine) cream along with a non-adhesive dressing/bandaid until the area is completely heal.