What causes the sudden appearance of many lumps on the legs that are also itchy?

Generally, sudden appearance of many bumps on the legs accompanied by itching may be caused by insect bites, dry skin, eczema, folliculitis, allergic dermatitis, or other reasons. The solution should be selected according to the specific cause in order to achieve therapeutic effectiveness. It is recommended to seek medical attention promptly and follow medical advice for treatment. Details are as follows:

1. Insect bites: When the leg is bitten by insects such as mosquitoes, fleas, or bees, toxins or allergens in the insect saliva can cause local inflammatory reactions on the skin, resulting in redness, swelling, bumps, and itching. As directed by a physician, apply medications such as calamine lotion, zinc oxide ointment, or erythromycin ointment to relieve itching symptoms.

2. Dry skin: When skin becomes dry, its barrier function is compromised, making it easier for moisture loss and invasion by external irritants to occur, which can lead to skin inflammation and itching. Dry skin on the legs may easily develop bumps and itching. Use mild moisturizing lotions or creams regularly on the legs. Avoid using harsh detergents and soaps, reduce the frequency and duration of bathing, and avoid excessive scrubbing or washing with hot water.

3. Eczema: Eczema is an inflammatory skin disease caused by various internal and external factors. When the skin on the legs is stimulated by internal or external factors, it may lead to symptoms such as redness, bumps, blisters, and itching, often accompanied by blisters. Follow medical advice to use medications such as hydrocortisone butyrate cream, mometasone furoate cream, or desonide cream to treat the condition and relieve itching.

4. Folliculitis: Folliculitis is an inflammatory condition caused by bacterial infection of hair follicles. When follicles on the legs become infected with bacteria such as Staphylococcus aureus, it can cause redness, pain, and itching around the follicles, forming red bumps accompanied by pain. Follow medical advice to use medications such as cefuroxime axetil granules, acetaminophen tablets, or ibuprofen capsules for anti-inflammatory treatment.

5. Allergic dermatitis: Allergic dermatitis is an inflammatory skin disease triggered by allergens. When the skin on the legs comes into contact with allergens such as pollen, dust mites, or pet dander, it can cause symptoms such as redness, bumps, and itching, often accompanied by significant itching. Under a doctor's guidance, use antiallergic medications such as diphenhydramine tablets, flumethason e tebutate ointment, or halometasone ointment for treatment.

In daily life, wear loose, breathable clothing to avoid friction and skin irritation.