The clinic nurse admits a client taking azelaic acid (Azelex). What condition is this medication typically used to treat?

Azelaic acid is primarily used to treat acne. This medication works by reducing inflammation, killing acne-causing bacteria, and promoting the turnover of skin cells to prevent clogged pores. It is also effective in treating rosacea, which can sometimes be confused with acne due to similar appearances; however, its main indication is for the treatment of acne vulgaris.

While eczema, hair loss, and herpes simplex may require different treatments, azelaic acid is not indicated for these conditions. Eczema often requires moisturizers and corticosteroids, hair loss treatments like minoxidil or finasteride, and herpes simplex typically needs antiviral medications. Thus, the specificity of azelaic acid's mechanism of action and its approved uses aligns it closely with acne treatment, making this the correct answer.