Reddit has been known to come up with some genius beauty hacks — making long-wear lipstick more comfortable, sharpening dull tweezers — the latest of which is a thrifty treatment for ingrown hairs down there.

In the Skincare Addiction subreddit, source of beauty tips both questionable and profound, one Redditor posted a query about Cosrx BHA Blackhead Power Liquid, a K-beauty serum hailed for its ability to dispense sebum and blackheads. "I have some ingrowns in my nether regions and am wondering if this product would be effective in treating those," littlepastel wrote. "I really need something effective down there! Is BHA the right active to use?"

Excellent question. BHA — aka beta hydroxy acid — is a powerful skin-clearing ingredient, according to Shari Marchbein, a board-certified dermatologist in New York City. BHAs, the most well-known example used in over-the-counter products being salicylic acid, are oil-soluble and can therefore penetrate deep into pores helping to unclog them and remove dead skin," she tells Allure. "It is also used as an exfoliant, helping to slough off dead skin."

This sounds promising for any ingrowns, as several Redditors noted that Cosrx BHA Blackhead Power Liquid did indeed help clear up their bumps left from shaving, both on the bikini line and under the arms. However, Marchbein explains there's an important distinction to be made. BHA's exfoliating, anti-inflammatory powers may help clear any mild acne (yes, you can get acne on your vulva) or folliculitis (aka inflamed hair follicles), but it won't actually help full-on ingrown hairs.