It should be noted that sucking on ice cubes is different from chewing them. You may want to suck on ice cubes to get relief from a dry mouth or to quench thirst. This is not considered a disorder if it is not compulsive.
For acne prone skin, Niacinamide is one of the best ingredients to use to help soothe inflammation, balance skin oils and keep things under control. Niacinamide helps with acne by acting as an anti-inflammatory, hydrates skin for a healthy lipid barrier, and regulates oil production to prevent excessive oiliness which clogs pores.