Small hard bumps around the areola are considered to be related to Montgomery’s nodes, eczema, hives and allergic reactions. 1. Montgomery’s nodes: Montgomery’s nodes are mainly located in the peripheral part of the areola. The development of alveolar and lobular hyperplasia in the mammary glands from the 8th week of pregnancy can lead to breast enlargement. Montgomery’s nodes appear on the skin around the areola. 2. Eczema: Eczema can also cause small hard bumps around the breast. The development of eczema may be related to genetic factors, immune abnormalities, changes in female hormone levels and other causes. 3. Urticaria: Urticaria is an edematous mass of limited pus on the surface of the skin and mucous membranes. The occurrence of this disease may be related to food, pathogenic microbial infection, drugs, physical stimulation. 4. Allergic reaction: after contact with pollen, dust mites and other allergens, allergic reactions can be induced in the body, resulting in small hard lumps around the areola. Small hard lumps around the areola should also consider trauma, inflammation, tumors and other factors, it is best to go to the breast surgery of the hospital for a comprehensive breast examination, to clarify the specific causes of small hard lumps around the areola.