Allergic red bumps are considered to occur with the following diseases: 1. Eczema, the rash manifests itself in the form of erythema, papules, blistering rash, blisters, vesicles, exudation, crusting, and is accompanied by a certain amount of itching. Clinical treatment may include oral loratadine capsules, one capsule per day at night, combined with levocetirizine hydrochloride capsules, one capsule per day in the morning, and topical denuded ointment. If there is vesiculation and exudation, topical mupirocin ointment can also be used for treatment. 2. Consider the possibility of urticaria is more likely. It can be treated by taking Abastin capsules orally three times a day, one capsule at a time, and using topical glycolic lotion. 3. Consider the possibility of erythema multiforme, which is also caused by allergies. It is possible to have edematous erythema scattered all around the body, and some of the erythema can be fused, accompanied by a certain itching sensation, you can take oral chlorpheniramine maleate tablets and topical dinaide ointment for treatment.