Toxic Egg

Toxic Eggs serve to protect Grub Pods similar to the Swarm Egg which are also created as a defensive measure. The Toxic Pod may also represent Grubs in early development, as they release deadly toxic gases when approached. Toxic Pods are infrequently seen throughout the game, appearing first on the Von Braun 's Hydroponics Deck.

Strategy
Toxic Pods are basically traps designed to ward off digging through Pods for Healing Glands and Psi Organs, as their toxins are only released on close contact. They can be placed both on floors and on the walls, making them even trickier to avoid. If you want to risk setting them off for the chance of finding something inside, then by all means try to loot them, but don't be surprised if you get a mouthful of toxins trying. While their direct threat is pretty low, the cost to you in terms of Anti-Toxin Hypos may not be worth dealing with if you don't care about collecting the Toxic Pods' contents.
 * Albeit, if you're careful enough, you can search the egg and destroy it at your leisure (albeit rather using a ranged weapon, unless your melee weapons is of a greater range, like PSI sword or a laser rapier). Duck and slowly approach them in small steps, aiming at them. If you see the interface outline - you can search them. After that you can destroy them or leave them alone.