Erythematous papules on the abdomen may be related to contact dermatitis, eczema, urticaria, and allergic purpura, etc. The treatment is based on the cause of the disease, and the symptoms are relieved by lifestyle modification and medication (loratadine tablets, etc.). 1. Contact dermatitis: It may be related to contact with certain allergens, and small rashes, papules or red spots with itching will appear on the skin. You can apply hydrocortisone butyrate cream, halometasone cream and other medications, together with oral loratadine tablets and other treatments. 2. Eczema: There will be intense itching of the skin, with reddish flushed rashes on the itchy areas, which will be accompanied by vesicles and oozing. It can be relieved by applying glycerite lotion and treated with oral medication such as cetirizine hydrochloride tablets. 3. Urticaria: Urticaria is related to the contact of allergens, a red rash will appear on the body, and after scratching, it will form a red rash in the form of a wind ball. It can be treated with oral medication such as fexofenadine hydrochloride tablets and diclofenac tadalafil tablets if necessary. 4. Anaphylactic purpura: Typical symptoms are petechiae and bleeding spots on the skin. Prednisone acetate tablets, rutin tablets and other drugs can be used to treat. There are many other causes of abdominal erythematous papules (such as insect bite dermatitis, etc.), patients need to consult a doctor in a timely manner, cooperate with the doctor to do a systematic examination, and strictly comply with the doctor’s instructions for treatment.