... twice a day, each with 20 to 50 minutes, suitable for individual circumstances, when the skin ... to brace the affected area. Generally about 10 minutes, you can feel the obvious burning sensation. ... caution, may cause skin redness using the site.5. If local redness, burning is normal, natural ... . Gently with water or neutral detergent, slightly (5 minutes wash).7. Pregnant women and children should not ...