What Causes Acne That Does Not Respond to Treatment
Acne that keeps coming back despite creams, pills, or other treatments is called treatment-resistant or recalcitrant acne. This type often needs stronger options like isotretinoin, a powerful oral medicine.[1][3][4] It happens when the usual causes of acne, like too much oil, clogged pores, bacteria, and swelling, do not fully improve with standard care.[1]
One big reason is changes in the skin’s bacteria, especially Cutibacterium acnes, or C. acnes. This germ lives on everyone’s skin, but certain types grow out of balance in acne-prone people. Over time, using antibiotics too long or not enough can make these bacteria resistant. They stop responding to the drugs, so acne sticks around.[1][2]
Clogged pores from too many skin cells, called hyperkeratinization, play a role too. Skin cells build up and block hair follicles, trapping oil and bacteria. Even with treatments, this process can keep going if not fully addressed.[1]
Extra oil from overactive sebaceous glands makes things worse. Hormones like androgens and growth factors such as IGF-1 boost oil production, creating a perfect spot for bacteria. In some people, this oil flow stays high no matter what topical treatments they try.[1]
Hormonal issues stand out, especially in women. High androgen levels can drive ongoing acne, showing up as cysts or pimples around the chin or jaw before periods. These cases often ignore regular treatments until hormones get balanced.[4][5]
Other factors include wrong medicine choices or not using them right. For example, mild acne treated with strong antibiotics might lead to resistance, while severe nodular acne needs systemic drugs from the start.[3][4] In older adults, acne can link to medicines, cosmetics that clog pores, or hidden endocrine problems, making it hard to clear.[4]
Skin microbiome shifts also matter. The mix of germs on acne skin differs from healthy skin, with some C. acnes strains causing more harm based on the person’s body response and surroundings.[1]
Sources
https://pmc.ncbi.nlm.nih.gov/articles/PMC12735603/
https://blogs.the-hospitalist.org/topics/acne
https://clinicaltrials.gov/study/NCT07296523
https://www.ncbi.nlm.nih.gov/books/NBK525949/
https://www.dovepress.com/efficacy-and-safety-of-hormonal-therapies-for-acne-a-narrative-review-peer-reviewed-fulltext-article-CCID
https://www.pharmacytimes.com/view/the-educated-patient-clearing-up-acne
