Where should this product NOT be applied?

This 3% solution has clear limitations you should follow:

• External use only. It is a solution for treating the outer surface of the skin and is not meant to be swallowed or used internally in any way.
• Not for eyes and mucous membranes. Keep it away from the eyes, the inside of the nose and mouth, and other mucous areas. If it accidentally gets into the eyes, rinse them promptly with plenty of clean water.
• Not for large areas or prolonged application. The product is designed for careful treatment of small skin areas, not for repeatedly covering extensive surfaces or for long-term continuous use on the same spot.

It is also sensible to keep the bottle out of children's reach, as with any first-aid liquid. If the skin becomes irritated after application — redness, stinging that does not pass, discomfort — stop using the product. And if you are unsure whether it is suitable for your specific situation, consult a specialist rather than guessing; the solution is a basic hygiene product, not a substitute for professional advice.