Hi. Thanks for your query. Noted the history about your son, developing multiple bumps on the ear lobe and the head of the crus helix is indicative of the following: -Insect bite - Erysipelas. Once of them has gone into infection and has increased into a larger one and hence giving the pain and tenderness. I would advise the following: - Clean the area with liquid povidone so that hte area becomes sterile to avoid secondary infection. Oral antibiotic and anti-inflammatory medicines to tide over the problem. He shall be fine soon.