What causes red bumps on the body that become itchier when scratched?

Red bumps appearing on the body that become itchier when scratched may be caused by physiological factors, or could result from allergies, eczema, and other conditions. The specific causes are analyzed as follows:

1. Physiological Causes

If the skin is not properly protected and gets bitten by insects, their saliva entering the body can trigger an allergic reaction, leading to symptoms such as itching and swelling. If there are no other physical discomforts, this is usually considered normal and can be relieved by applying medicated oils or insect repellents like cooling oil or floral water.

2. Pathological Causes

1) Allergy

In individuals with sensitive constitutions, exposure to certain allergens—such as specific foods, pollen, or mites—can cause excessive dilation of capillaries, triggering an immune response. This may lead to symptoms including itching, rashes (papules), and runny nose. Under a doctor's guidance, antihistamine medications such as cetirizine hydrochloride tablets or loratadine capsules may be used for relief.

2) Eczema

When affected by external substances, patients may develop inflammatory changes in the epidermis and superficial dermis, manifesting as papules, intense itching, and skin damage from scratching. Treatment may involve corticosteroid medications as prescribed by a physician, such as methylprednisolone tablets or hydrocortisone cream.

Besides the above common causes, conditions such as diabetes may also be responsible. If symptoms are severe, prompt medical evaluation is necessary.