Acid Ant secretes an acid from his body which is then stored in a special pack on his back. He then shoots this acid from his gauntlets. Thankfully he mostly uses this for breaking and entering into safes and vaults. He's not so twisted that he would deliberately shoot acid into someones face. He prefers to use his powers in more creative ways and is much more likely to run from a fight if he can. Of course that's not to say that he won't ever use his powers on others. If cornered, he's far more likely to prioritise his own freedom over someone else's safety.