What causes lumps under the armpit, especially when they're swollen, painful, and contain white, foul-smelling material?

Lumps under the armpit may be caused by various factors, including infections, allergies, and skin disorders. If the lump is swollen, painful, and contains white material with an odor, it could be due to conditions such as abscesses, boils (furuncles), or urticaria. Specific causes are analyzed below:

1. Abscess

An abscess is a localized pus-forming inflammation caused by bacterial infection, usually accompanied by symptoms such as pain, swelling, and redness. It may contain white pus. Treatment under a doctor's guidance may include medications such as Amoxicillin Capsules or Cefuroxime Axetil Tablets. Keep the armpit area well-ventilated and regularly disinfected.

2. Boil (Furuncle)

A boil results from bacterial infection around a hair follicle, leading to localized pus formation and symptoms like pain, swelling, and redness. The lesion may also contain white pus. If the boil has developed pus, medical treatment may require surgical incision and drainage of the abscess under professional supervision.

3. Urticaria

Urticaria is an allergic skin condition typically characterized by itching, redness, swelling, and blisters, which may contain clear fluid. Treatment under medical guidance may include topical Mometasone Furoate Cream and oral medications such as Levocetirizine Tablets or Compound Glycyrrhizin Tablets.

In addition, herpes infection could also be a possible cause. It is recommended to seek timely medical attention for accurate diagnosis and appropriate treatment. Meanwhile, maintain good personal hygiene, keep the affected area clean, and avoid potential infections.