Condition analysis: The main component of alum is hydrated potassium aluminum sulfate. If it is used to soak feet, first of all, the concentration should not be too high, and the water temperature should not be too hot, as long as it does not feel hot.

Opinions and suggestions: However, the concentrated alum solution is obviously irritating to the skin and mucous membranes, so the soaking time should not be too long each time. Just use the solution to bathe for a few minutes. Do not use it for long-term foot soaking. May cause damage to foot skin.