See if there is pepper paste in your girlfriend's gel. If yes, it is recommended to stop using it immediately. Because the red pain on her body may be that the epidermal tissue was destroyed by pepper paste.

I suggest your girlfriend choose a slimming gel with natural ingredients, because it seems that her skin should be quite sensitive. It should be better to recommend Nivea Slimming Gel containing white tea essence to her. This is different from the gel of pepper paste. Pepper paste has a light taste and a much milder upper body effect. It can be used as slimming cream, and the effect is good. It can slim down and shape, and it can also make the skin smooth and firm. If you give it to her, she will.