Plant it to grow Biohazard Sign. Do not lick under any circumstances.
Biohazard Sign Seed price in Growtopia: sells for about 4/WL, buyers pay about 3/WL (median of 21 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: HOWPY, RKUYJ, PANSE, I997, Z28CX