The plant monographs with dermatological relevance of the former German Commission E have recently been reviewed.
According to Baumann, "Botanical compounds for which dermatologic and cosmetic applications have emerged include: olive oil, chamomile, colloidal oatmeal, oat kernel extract, feverfew, acai berry, coffee berry, curcumin, green tea, pomegranate, licorice, paper mulberry, arbutin, and soy. "Many of these botanical sources offer biologically active components that require further in vitro and in vivo investigation".
A review of 35 plant families found that a "variety of phytomolecules, derived in particular from polyphenols, triterpenes and sterols classes, demonstrated a promising activity."
Colloidal oatmeal may be beneficial in psoriasis. Aloe vera may help in atopic dermatitis. In both these conditions, the benefit may arise from anti-inflammatory properties. "For combating acne and rosacea, green tea, niacinamide and feverfew are considered efficacious. For hyperpigmentation and antioxidative capabilities, licorice, green tea, arbutin, soy, acai berry, turmeric and pomegranate are among those plants and compounds found to be most beneficial. Additional research is needed to determine to confirm and elucidate the benefits of these ingredients in the prevention and management of skin disease."
An assessment of clinical trials on green tea preparations and their uses in dermatology found some evidence for potential benefits.