What Is Alum and How Does It Affect Skin
Alum is a mineral salt, often potassium alum, known for its astringent and antibacterial properties. When applied to skin, it can help tighten pores, reduce minor bleeding from shaving, and create a protective layer that may limit bacterial growth.
Common Alum Uses for Skin
People use alum as a natural aftershave to soothe razor burns and as a mild antiperspirant for underarms. It is also applied to small cuts, insect bites, and rashes to calm irritation, reduce redness, and support faster healing by drying out the affected area.
How to Use Alum Safely on Skin
For facial use, dissolve a small piece of alum in water and apply with a cotton pad, then rinse after a few minutes. For shaving, wet the alum stick and glide it gently over freshly shaved skin. Always patch test first, avoid broken or sensitive skin, and rinse thoroughly. Learn more about alum skin safety from the American Academy of Dermatology at aad.org.
