In summer, the skin is red when touched, which may be related to skin capillary expansion, solar dermatitis, contact dermatitis and other factors. 1. Skin capillary expansion: the summer weather is hot, the skin blood circulation speed up, capillary expansion, the skin surface is more likely to be stimulated, easy to appear the symptoms of the skin when touched. 2. solar dermatitis: a touch of red skin in the summer may suffer from solar dermatitis, in the summer under ultraviolet radiation is easy to sunburn, generally in the exposed parts of the skin red and swollen within a few hours after exposure to the sun, can also blisters or blisters. 3. contact dermatitis: a touch of skin in the summer may be suffering from contact dermatitis, skin contact with irritating substances or sensitizing substances, resulting in skin inflammation, redness, swelling, erythema, and other reactions occurring at the site of contact or even outside the site. In the summer, the skin is red when touched can be first observed, such as skin redness phenomenon can not be naturally receded, need to go to the hospital in a timely manner.