Perhaps your son doesn't have folliculitis or has an unusual variation.
From the dailyherald.com
The longer he continues to take the antibiotic, the more resistant the folliculitis will become.
From the dailyherald.com
He has had them for three years, and once a year he sees a skin doctor who told him he had folliculitis.
From the dailyherald.com
Swimmer's itch isn't the same as hot tub folliculitis, another itchy skin rash that's often transmitted in hot tub water, swimming pools and water slides.
From the stltoday.com
More examples
Inflammation of a hair follicle
Is a superficial infection of hair follicles caused by bacteria or fungus, characterized by small, white-headed pimples.
An infection or inflammation of the follicle, at the root of a hair. Folliculitis may be aseptic, as in eosinophilic folliculitis.
Inflammation of the hair follicles. Can be caused around the stoma by ripping body hair off when pouches are removed or by shaving closely with a safety razor.
A skin condition with symptoms of red pustules around hair follicles that can itch severely. It can occur anywhere, but is often found on the trunk. It is often caused by the bacteria staphylococcus.
A common disorder characterised by inflammation of the hair follicle. Also known as Pseudofolliculitis Barbae (PFB) or Tinea Barbae. Appearance of raised lumps and a rash. Prevalent in Type V and VI males.