Sicilian sumac (Rhus coriaria) has a long-standing history in traditional Mediterranean and Middle Eastern medicine for treating various skin conditions, including dermatitis. The use of sumac in folk remedies is primarily attributed to its astringent, anti-inflammatory, and antimicrobial properties. Traditional texts and ethnobotanical surveys report that sumac leaves, fruits, or extracts were often used topically to soothe inflamed skin, reduce itching, and promote wound healing.

Scientifically, sumac is known to contain high levels of polyphenols, flavonoids, and tannins, compounds with potential anti-inflammatory and antioxidant effects. Some in vitro studies suggest antimicrobial activity against bacteria that may complicate dermatitis. However, there is a lack of robust clinical trials or in vivo research specifically supporting the efficacy of sumac for dermatitis in humans. Its use for dermatitis is thus justified mainly by tradition and extrapolation from its general anti-inflammatory and antimicrobial effects rather than direct scientific validation.

In summary, sumac’s application for dermatitis is rooted in traditional medicine, with some plausible biological mechanisms, but lacks high-quality clinical evidence. Its evidence rating is low to moderate, reflecting the absence of rigorous scientific studies specifically on dermatitis.