How do these differ from plain hydrocolloid patches?

They add salicylic acid to the hydrocolloid layer, so they both absorb fluid and help clear the pore. Plain patches only absorb fluid.

Do they work on cystic acne?

Not much. They work best on whiteheads that have come to a head. Deep, painful cysts usually need other treatment.

They are oil-free and marketed for sensitive skin, but salicylic acid can still sting. Try one patch first and avoid broken skin.

Overnight or up to about eight hours is typical. Replace it when it turns white with absorbed fluid.

Yes, the patches are thin, but makeup can loosen the edges. They are easier to hide on bare skin.

Yes, Hanhoo lists these patches as cruelty-free.

At eBay, for $46.61, as of our latest check.

2 stores we checked sell it, including eBay, Walmart.

$46.61at eBayChecked Nov 8

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