Red, swollen acne and what treats it

What makes acne inflammatory

Acne comes in two broad groups. Blackheads and whiteheads are clogged pores without much inflammation. Papules, pustules, nodules and cysts are inflamed: the plugged follicle has filled with bacteria and the immune system has reacted, which brings the redness, swelling and pain.

Why it matters

Inflamed spots are the ones that leave dark marks and scars. Deep nodules and cysts scar most often, so treating them early pays off more than waiting for them to settle.

What works on the skin

Benzoyl peroxide kills acne bacteria and is the usual first step for red spots. Pairing it with a retinoid such as adapalene treats the clogging underneath. Topical antibiotics also calm inflammation, but dermatologists combine them with benzoyl peroxide so the bacteria don't become resistant. Azelaic acid is another option that also fades dark marks. For how these line up by severity, see our sister guide on treatment for inflammatory acne.

How to tell your acne is inflammatory

Inflammatory acne is red, raised and tender to the touch. Some spots have a white or yellow head of pus; others sit deeper with no head at all and ache. Non-inflammatory acne looks different: small skin-colored bumps (whiteheads) or dark dots in the pores (blackheads), usually not sore. Most people have a mix, and the inflamed spots decide how strong the treatment needs to be.

How long treatment takes

Acne treatment is slow. Expect to use a product every day for two to three months before judging it, even if the first weeks bring some dryness. Stopping and switching every few weeks is one of the most common reasons acne seems to resist treatment. Keep going after the skin clears too, because inflamed acne tends to return when treatment stops.

A simple routine around the treatment

Inflamed skin is easily irritated, so the rest of the routine should be plain. Wash twice a day with a mild cleanser and lukewarm water, pat dry, and use an oil-free moisturizer and sunscreen. Skip scrubs, toners with alcohol and anything that stings. Don't pick or squeeze: that pushes the inflammation deeper and is one of the main reasons red spots leave marks.

Mild, moderate or severe

Dermatologists grade acne by how many inflamed spots there are and how deep they go. A few red pimples is mild and usually responds to products from the pharmacy. Many inflamed spots across the face, chest or back is moderate and often needs a prescription. Painful nodules and cysts, or acne that is leaving scars, is severe and belongs with a dermatologist from the start.

Marks left behind

As inflamed spots heal they often leave a flat pink, red or brown mark. These marks are not scars and usually fade over months; daily sunscreen helps because sunlight darkens them, and azelaic acid can speed fading. Pits or raised bumps that remain are scars, and those need a dermatologist rather than a cream.

When pills come in

When creams aren't enough, a dermatologist may add an oral antibiotic for a limited time, a hormonal treatment for women, or isotretinoin for severe nodular acne that hasn't responded to anything else.

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