Skin breaks out when scratched may be related to atopic dermatitis, delayed cutaneous porphyria, dry skin and so on. 1. Allergic dermatitis: blisters, itching and other manifestations of dermatology occur during acute attacks, and the skin breaks down easily after scratching. 2. delayed cutaneous porphyria: increased skin fragility is the main feature of this disease, mostly seen in middle-aged people, can lead to photosensitive dermatitis and increased skin fragility of the patient’s skin, and slight friction can make the friction area appear broken skin. 3. Dry skin: some people often like to wash the local skin due to psychological factors, resulting in too little skin oil, causing dry skin, itching, scratching easily lead to skin breakage. Skin scratching can also be seen in other reasons, it is recommended to consult a doctor in a timely manner, clear reasons, under the guidance of the doctor for targeted treatment or treatment.