widening with smiling
+2
Nasal widening with smiling is very common. Typically, this is the result of activity of the nasal alar or dilator alar muscles. It can be more profound in people with widened alar bases or nostrils to begin with. Certainly, narrowing the alar base can reduce the width of the nostrils and may also make it more static when smiling if the resultant narrowing disrupts the muscles that cause the
widening to begin with. To thin the skin of the nose can be done but should be approached with trepidation since overly agressive skin thinning or debulking of the dermal fat can result in skin necrosis and loss vis a vis the "Michael Jackson" effect. I hope this information helps.