Red, itchy and hard bumps may be caused by nodular itchy rash, urticaria and papular urticaria. 1. Nodular itchy rash: the disease can lead to firm, itchy hemispherical nodules on the patient’s skin, which may result in red, itchy and hard packs, and may be accompanied by symptoms such as mossy changes and epidermal peeling. 2 urticaria: mostly related to allergies, commonly caused by cold or heat, or contact with pollen, fur, etc., often manifested as edematous erythema, accompanied by itching, which may also lead to red, itchy and hard bags on the skin. 3. papular urticaria: usually associated with mosquito bites, can be manifested as a wind ball like erythema, the center of the small blisters can be seen, accompanied by itching. It can also cause red, itchy and hard bags on the skin. Red, itchy and hard packets may also be associated with other factors, it is recommended to seek medical attention as soon as possible to clarify the cause and give targeted treatment.