Quick answer
Cystic (nodular) acne is deep, painful lumps that can scar; hormonal acne is adult acne, often on the jawline, that flares with the cycle; and "fungal acne" is not acne but a yeast folliculitis of itchy, uniform bumps. A doctor sorts them by how they look, where they sit and whether they itch.
- Cystic or nodular: scarring is the risk. In 1,972 people seeing dermatologists, 43% had scars, and a longer wait for effective treatment was linked to scarring.
- Hormonal: in a 410-woman trial of spironolactone, 82% reported improvement at week 24 against 63% on placebo.
- Fungal: not acne. Itchy, same-size bumps on the chest or back, linked to heat and humidity; antifungal medication is the mainstay.
What is the difference between cystic, hormonal and fungal acne?
They differ in what the spot is, what drives it and what treats it. Cystic acne is the severity of the spot, hormonal acne is the pattern and the driver, and fungal acne is a different condition that looks like acne. The table puts them side by side; the sections below take each in turn.
| Type | How it looks | What drives it | Treatments the evidence names |
|---|---|---|---|
| Cystic or nodular acne | Deep, firm, painful lumps lasting weeks; scarring risk | Severe inflammation of the follicle | Oral isotretinoin is strongly recommended for severe or scarring acne |
| Hormonal (adult female) acne | Jawline, chin and lower face; flares around the cycle | A hormonal driver, which a doctor looks for | Topical retinoids and benzoyl peroxide; conditional recommendation for combined oral contraceptive pills and spironolactone |
| "Fungal acne" (Malassezia folliculitis) | Itchy, same-size bumps on the upper trunk, such as the chest and back; no blackheads | Yeast overgrowth in the follicle, helped by heat, humidity and occlusion | Antifungal medication after confirmation |
What is cystic or nodular acne, and why does scarring matter?
Cystic or nodular acne is the severe form, deep, firm, painful lumps under the skin that can last for weeks, and it carries the highest risk of scarring. The fuller explanation of the three forms of acne is in adult acne: what a doctor checks first.
The scarring figures come from a survey of 1,972 people consulting dermatologists for active acne: 43% had scarring, and 69% of those with scars had only mild or moderate acne on the day. Scarring was linked to acne severity, relapsing acne, male gender and the time between the start of acne and the first effective treatment, which the authors call a modifiable risk. That is the reason deep lumps are not a wait-and-see problem. The 2024 American Academy of Dermatology guideline strongly recommends oral isotretinoin (Roaccutane) for acne that is severe, causes scarring or psychosocial burden, or has failed standard treatment; the checks that come with it are in isotretinoin: what a doctor checks. Marks and scars after the lumps settle are covered in acne scars: what each type needs.
What is hormonal acne, and what treats it?
Hormonal acne is the name for adult acne, more often in women, that sits along the jawline and chin and flares around the menstrual cycle, pointing towards a hormonal driver. Irregular periods or excess hair growth alongside it raise a separate question, polycystic ovary syndrome, which a doctor checks for before the skin is treated. Acne on the back and chest follows a different plan, set out in back acne.
The guideline lists treatments by strength of evidence. Strong recommendations cover benzoyl peroxide, topical retinoids, topical antibiotics and oral doxycycline; conditional recommendations cover combined oral contraceptive pills and spironolactone, both prescription medicines. The main randomised trial of spironolactone for women, SAFA, enrolled 410 women with facial acne that warranted oral antibiotics, with a mean age of 29. Spironolactone started at 50 mg a day and rose to 100 mg a day from week 6, with topical treatment allowed. At week 12 self-reported improvement was 72% against 68% on placebo, which was not a significant difference; at week 24 it was 82% against 63%. Investigator-rated success at week 12 was 19% against 6%. Headache was reported more often (20% against 12%), and no serious adverse reactions occurred. The effect built slowly, so the timepoint matters.
What is "fungal acne", and why is it not acne?
"Fungal acne" is Malassezia (pityrosporum) folliculitis, an infection of the hair follicle by a yeast that normally lives on the skin, and it is not acne: the cause is a yeast, not the blocked-pore process of acne. A review describes it as an itchy eruption of papules and pustules on the upper trunk, common in young to middle-aged adults and people with weak immunity. The key features are itch and bumps of similar size with no blackheads.
It resembles acne closely enough that it is often mistaken for it, and a 2026 review notes this can delay treatment and let it persist for years. The same review warns against putting antifungals on bumps without a confirmed diagnosis, a concern the authors link to social media interest. Confirmation is by microscopy of a sample taken by tape stripping or with a comedo extractor, which shows budding yeast without hyphae, and a biopsy can settle doubtful cases.
Treatment is antifungal medication. In a review of the treatment studies, oral itraconazole for 1 to 4 weeks gave a clinical effect of 69 to 100% and fluconazole about 80%; topical azoles and selenium sulfide are also used. A 44-person comparison found that ketoconazole cream and oral itraconazole both improved the eruption, the cream more slowly. Recurrence is common, so maintenance treatment is used. These are prescription decisions for a doctor, not a home regimen.
How does a doctor tell them apart?
The first check is the look and the place: lumps deep in the skin, spots along the jawline, or small identical itchy bumps on the chest and back. The second is the history: how long, whether the spots follow the cycle, whether there is itch, what has already been tried, and which medicines are being taken. The third, where fungal folliculitis is suspected, is a sample for microscopy, because the appearance alone can mislead.
Hormonal acne also brings questions about periods, excess hair and medicines. Two things can sit together: Malassezia folliculitis is reported more often in people who have acne than in the general population, so a person can have both. The visit-before-treatment logic is set out in acne treatment in Setia Alam.
Why do Malaysian heat and humidity matter?
Heat and humidity matter most for the fungal kind. Both reviews name high ambient temperature and humidity, and clothing, as factors that change the follicle environment so the yeast becomes a problem, and a 2026 review lists hot, humid weather and blocked follicles among the risk factors. Prevalence varies by region, according to the 2026 review. For hormonal and cystic acne, the same weather does not change the diagnosis, but sweat and occlusion are part of the history a doctor takes.
When should you see a doctor?
See a doctor when lumps are deep or painful, when spots leave scars or marks, when acne has not settled with ordinary care, when it flares with the cycle or comes with irregular periods or excess hair, or when itchy, same-size bumps on the chest or back do not respond to acne products. Because the delay to first effective treatment is a modifiable scarring risk, the evidence does not favour waiting. Dark or red marks after spots are a separate question, answered in red or dark marks after acne.
How does The Retreat Clinic in Setia Alam handle acne?
Dr Ong assesses active acne first, sorting which kind it is and what is driving it. Acne severe enough that an oral retinoid is being weighed is referred to a dermatologist or another suitably qualified prescriber, because the clinic does not prescribe it. Once the acne itself is controlled, the clinic treats the texture and marks it leaves behind, and it does not treat scarring over acne that is still active.
