Is applying 95% pure alcohol on scalp (twice daily, all life) safe for skin?

Minoxidil 5% liquid solution is made of 5% minoxidil + 95% pure alcohol. Solution must be applied twice every day, for the rest of user's life. Isn't that frequent and prolonged application of pure alcohol, eventually going to harm the skin/scalp where the solution is applied - cause an eczema or even cancer? And- which solution (liquid or foam) is less harmful for the skin & overall health? Liquid sol. contains 95% alcohol, foam sol. contains 30% alcohol + 50% propylene glycol + 15% water.