Cupping in dermatology

Urticaria

Urticaria (hives) is an inflammatory skin condition that can be very uncomfortable for patients but often resolves without intervention within several months after onset. In 2001, Li and Ding reported on the treatment with cupping of 40 patients with urticaria. The cure rate among the treatment group was cited as 55%, compared with 30% in the control group, who were treated with a traditional Chinese remedy and an unidentified first-generation antihistamine.^1,5 In 2020, Xiao et al. conducted a systematic review and meta-analysis of cupping therapy for patients with chronic urticaria. They identified 13 comparisons from 12 randomized controlled trials involving 842 subjects. The investigators found no significant differences between wet cupping and medication usage. They also found that cupping combined with antihistamine treatment was superior to antihistamines alone, and cupping therapy with acupuncture was more effective than acupuncture alone. The investigators did call for caution, citing the poor quality of the studies reviewed.⁶

It is important to note that it is difficult to attribute resolution of urticaria to the use of cupping given the self-resolution often associated with this condition. Antihistamines are the mainstay of therapy for urticaria, but in my personal experience, patients are not entirely satisfied with the level of symptom control with antihistamines alone and often search for alternative therapies to control the pesky hives and associated itch. In 2014, omalizumab (Xolair) was approved for treating chronic idiopathic urticaria, which has helped patients control symptoms of chronic idiopathic urticaria without needing to take antihistamines. There was no indication that the studies reviewed by Xiao et al. compared cupping against this new effective treatment. Therefore, these studies comparing cupping to medical management are outdated.

Acne, eczema, and psoriasis

Soliman’s 2018 review of cupping in dermatology included a few studies on these common cutaneous conditions. For instance, a 2013 single-blind prospective study by Xu et al. reported on the results of patients with moderate acne who received wet cupping (in the form of prickling bloodletting) twice weekly for 6 weeks.⁷ They reported that patients demonstrated improvement in the global acne grading system (GAGS) score by the end of the trial.^1,7 Unfortunately, cupping was not compared with standard acne treatments (that is, benzoyl peroxide, topical and oral antibiotics, isotretinoin, topical retinoids, spironolactone).

In evaluating cupping for acute eczema, wet cupping was compared with oral loratadine and topical ointments in a 2007 study by Yao and Li. They divided 88 cases into treatment and control groups, with the former group (n = 46) receiving bloodletting puncturing and cupping and the control group (n = 42) receiving oral loratadine and topical Pairuisong (an herbal ointment used in Chinese medicine). The investigators observed no significant difference in total effective rates but a superior difference in the rates of responses that were considered “cured” and “markedly effective” in favor of the cupping treatment.^1,8 However, a case report by Hon et al. has indicated that cupping therapy may be associated with more harm than benefit when used as an eczema treatment.^1,9

In addition, it is important to note that the past 5 years have been gamechanging in the management of chronic eczema in terms of the array of novel and effective therapies (e.g., dupilumab and JAK inhibitors) and chronic moderate-to-severe eczema has become very treatable. Similarly, acute eczema is often successfully managed with topical steroids, calcineurin inhibitors, and emollients. As such, there is no compelling reason to consider an unproven treatment such as cupping.

In 2020, Xing et al. reviewed 16 randomized controlled trials assessing the use of “moving cupping” for plaque psoriasis, with 1,164 patients meeting inclusion criteria. Moving cupping was found to be significantly more effective than “no-moving” cupping therapy, and moving cupping, combined with medications, performed better than medications alone.¹⁰ None of the trials evaluated in this study included randomized controlled trials that compared patients using any of the more modern psoriasis medications, specifically biologics. And, again, the studies evaluated were not of the highest quality.

The data that support cupping, as summarized above, are based mostly on case reports, and strong double-blind prospective studies are lacking. Additionally, most of the studies cited gauged the efficacy of cupping using qualitative endpoints, rather than standardized quantitative endpoints and scales. Moreover, spontaneous remission of various dermatoses can occur, or they can improve over time, including acute eczema, psoriasis, and, especially, urticaria.