Allergy. This situation is not what everyone wants to see, but the skin is erythema. I suggest you think about whether it is caused by allergies first. If we often come into contact with allergens in our lives, or are allergic to certain objects without knowing it, it is likely to lead to stress reactions and erythema on the skin.

It is hot and humid. This situation is very common in summer. When our skin is soaked in sweat for a long time and is in a hot and humid environment, it is very likely to lead to erythema on the skin. This situation is closely related to skin irritation and needs attention.