Itchy skin reddening when scratched and painful when pressed, may be hives, eczema, insect bite dermatitis and other causes. 1. Urticaria: it may be artificial urticaria, manifested by scratching or blunt instrument across the skin, skin tingling, may be accompanied by itching, nerve sensitivity can also cause the symptoms of pain when pressed. 2. Eczema: internal and external stimuli caused by a variety of factors causing inflammatory skin reactions, often manifested as erythema, papules, scales, etc., may lead to itchy skin scratching red and painful. Most of the acute stage is accompanied by oozing tendency of the skin. 3. Insect bite dermatitis: mosquito bites cause allergic reactions to the skin, which can also lead to symptoms of itchy skin, redness and pain when scratched. The itchy skin is red and painful, there may be other reasons, you need to go to the hospital in time for examination, to clarify the cause of the disease and follow the doctor’s instructions for treatment.