In many cosmetics there are chemical compounds derived from alcohol. It is tough to find cosmetics that are alcohol free. Is it permissible to use such products that include alcohol on one's skin?
Yes it is permissible to use products including alcohol to apply on skin, even if the product was Najis as far as you wash it before performing prayers. Alcohol which is used in manufacturing cosmetics is not Najis according the verdicts of many great Shia scholars.
Wassalam.