Back acne vs folliculitis: How can you tell?

What is the difference between acne and folliculitis?

Acne involves blockage and inflammation of the hair follicle and its oil gland. Folliculitis means inflammation of a hair follicle from any cause, including bacteria, yeast, irritation or blockage. Technically, acne falls within that broad definition, but the practical comparison is ordinary acne versus other causes of inflamed follicles.34

Blackheads and whiteheads are useful clues toward acne. An itchy upper back breakout aggravated by sweat raises the possibility of Malassezia folliculitis, caused by yeast normally found on skin. Bumps appearing one to two days after hot tub exposure suggest another form of folliculitis. These clues help guide an examination rather than confirm a diagnosis at home.23

Why does the distinction change treatment?

For acne, salicylic acid helps clear clogged pores, benzoyl peroxide reduces acne causing bacteria, and retinoids such as adapalene treat blackheads, whiteheads and some pimples. An acne label is a product category, not a diagnosis delivered by a bottle. Lower concentration benzoyl peroxide and wash formulations are less irritating options; buying the strongest treatment can cause unnecessary irritation, particularly for older skin.156

Bacterial folliculitis can require antiseptic care or antibiotics, while Malassezia folliculitis is treated with antifungal medicines. The nickname 'fungal acne' is convenient for conversation and less convenient for knowing which treatment to buy. An antidandruff shampoo used daily to wash affected skin can help Malassezia folliculitis. Irritation related folliculitis instead requires removing the trigger, such as hair removal or a blocking product. Do not stop a prescribed antibiotic yourself; discuss it with the prescriber if yeast folliculitis is suspected.24

What should you do next?

1. 1Note the pattern and recent changes. Tell your clinician about sweating, hot tub use, hair removal, greasy products and any medicines you take or recently stopped.
2. 2Avoid picking acne or scratching folliculitis. Picking can worsen acne, and scratching folliculitis can open the spots and worsen infection.
3. 3Use treatment as directed. Acne retinoids treat the whole affected area rather than individual spots and are often applied in the evening. For prescribed retinoids, ask your dermatologist before changing the amount, frequency or layering to manage irritation.
4. 4Judge progress on the right timetable. Acne treatment takes at least six to eight weeks before fewer breakouts appear. Some mild bacterial or hot tub folliculitis clears within days; yeast folliculitis treatment can take several weeks.

When should you see a doctor?

Arrange an examination for persistent bumps, unsuccessful treatment, deep painful lumps or scarring. A primary care clinician can usually assess folliculitis; severe or persistent cases warrant a dermatologist. An examination often identifies acne, while a swab of a pustule can help identify an infectious cause of folliculitis. Mention worsening bumps during prolonged antibiotic treatment because resistant bacterial folliculitis needs medical assessment. Seek urgent assessment if severe breakouts come with fever, joint or bone pain, or extensive or ulcerated skin lesions.12346