The unattractive medical term for a blocked hair follicle is a furuncle, which is simply another word for the ordinary boil. Boils are bacterial or fungal infections of individual hair follicles that can form in the armpit after shaving. These boils can be caused by ingrown hairs or irritation from the act of shaving itself. Sometimes sweat glands can become clogged due to certain skin conditions such as acne and can go on to form a boil. This happens a lot in the armpit region because of its proximity to the sweat glands. Sweat glands becoming blocked has nothing to do with the state of your personal hygiene. Acne-prone skin can change over time due to hormones and hormones are forever changing themselves.
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