Underarm pimples like a pustule may be caused by mosquito bites, folliculitis, boils and other reasons. 1. Mosquito bites: mosquito bites can easily cause skin infections resulting in pustules. 2. Folliculitis: Folliculitis is an inflammation caused by infection of hair follicles with bacteria or fungi, which manifests itself as single or multiple red papules. The main manifestation is the formation of red, itchy or painful spots and pustules around the hair follicles, which can spread outward until the pustules rupture and crust over. 3. Boils: Boils are localized acute purulent lesions of hair follicles caused by invasion of individual hair follicles and their surrounding tissues by Staphylococcus aureus or other pathogenic bacteria. It appears as a red, swollen, hot and painful nodule that gradually swells and develops a yellowish-white pus head at the top, which usually ruptures and exudes pus. There are many reasons that cause underarm acne like a pustule, it is recommended that patients should go to the hospital in time, under the guidance of the doctor to clarify the cause of the disease and take effective treatment.
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