What illness causes bumps to appear when the skin itches?

Itchy skin may be indicative of diseases such as eczema, contact dermatitis, and artificial urticaria.

1. Eczema: It may be a chronic inflammatory and itchy skin disease caused by multiple internal and external factors. This disease is characterized by recurrent episodes. If the patient is stimulated after the disease has healed, such as scratching, it may recur with symptoms like papules, vesicles, and blisters, accompanied by itchiness and exudation. Under a doctor's guidance, medications such as zinc oxide ointment, hydrocortisone butyrate cream, and mometasone furoate cream can be used.
2. Contact Dermatitis: If the skin is more sensitive, scratching may cause contact dermatitis, leading to skin bumps, redness, swelling, stinging, and other symptoms. Medications such as diphenhydramine hydrochloride tablets, loratadine tablets, and chlorpheniramine maleate tablets can be used for treatment according to a doctor's advice.
3. Artificial Urticaria: It is mainly caused by the skin being mechanically stimulated, which leads to the release of vasoactive mediators from mast cells, such as scratching, leaning on hard objects, or friction from clothing. Clinical symptoms may manifest as localized raised wheals, with or without itchiness. Artificial urticaria has a certain degree of self-limitation and can gradually disappear without specific treatment. If symptoms are severe, medications such as loratadine tablets, ebastine tablets, and levocetirizine dihydrochloride tablets can also be taken under a doctor's guidance.

In addition to the above diseases, it may also be infectious molluscum, which also requires timely treatment.