What causes itchy bumps on arms?

If small bumps appear on your arms and they are very itchy, the first thing you should consider is whether it is an allergy. If you are sure it is not an allergy, it may also be caused by eczema, dermatitis, etc. Generally, it will heal quickly by applying some medicine, so don't worry too much.

Type 1: Contact dermatitis

Contact dermatitis refers to an acute, subacute, or chronic inflammatory skin disease of the skin and mucous membranes caused by contact with certain external substances. It is characterized by erythema, blisters, papules, erosion and exudation at the contact site, and conscious itching. This disease has a clear history of contact and can heal itself after the cause is eliminated. It belongs to the categories of "lacquer sores", "toilet sores" and "strange medicine sores" in traditional Chinese medicine.

Type 2: Eczema

It is an allergic disease and belongs to type IV allergic reaction. The causes and triggers of eczema often vary depending on individual factors and the different stages of the disease, so they are difficult to determine. Clinically, it is characterized by significant itching with symmetrical distribution, acute symptoms mainly papulovesicular rash with a tendency to exudate, chronic symptoms mainly lichenoid changes, repeated attacks, and easy to become chronic.

Type 3: Atopic dermatitis

Atopic dermatitis, also known as atopic dermatitis, is a chronic, recurrent, itchy, inflammatory skin disease with a genetic history, high blood IgE, and may be accompanied by asthma and allergic rhinitis. Patients or their families often have a history of allergic diseases such as urticaria, asthma, and allergic rhinitis.

The fourth type: autosensitive eczema

Autosensitive eczema is a special type of eczema that is caused by the patient's allergy to certain substances produced by his or her own internal organs or skin tissues. The clinical characteristics are the sudden occurrence of scattered papules, red bumps, papulovesicles and small blisters, which appear in clusters and can merge with each other. Before the onset of the disease, there is often a history of acute worsening of primary skin diseases such as eczema on the skin and other parts of the body.

Stasis dermatitis

Stasis dermatitis is also known as varicose eczema. Clinically, the disease is characterized by erythema and brown pigmentation on the lower legs, papules, blisters, and erosions that are difficult to heal and recur. In the later stages, the skin becomes dry, desquamated, and has lichenoid changes. It is more common in middle-aged and elderly people, and the lesions are more likely to occur on the calves.