A Mosquito Blood Sack is a resource that is dropped from Mosquitos and Tiger Mosquitos in Grounded. Blood sacks are required item to unlock the Healbasa, which is a useful healing item that can heal both players and creatures.
Healbasa is unlocked by analyzing the Mosquito Blood Sack. Here’s a guide that will help you to find this resource.
How to get a Mosquito Blood Sack in Grounded

First you need to find a Mosquito or a Tiger Mosquito.
Mosquitoes hang around near bodies of water and damp areas in the backyard. The most common spots you’ll see them buzzing around are in the following areas:
- Koi Pond edges
- Flower Bed areas
- Flooded Zones
- Woodpile and shed margins
There’s also a more dangerous variation called the Tiger Mosquito out in the upper yard/Castle Moldorc area that drops the same sacks when you kill them after they’ve bitten you.
That said, mosquitoes don’t just drop the blood sack the moment they die. Instead, you have to make sure they’re filled up with your blood first.
You might’ve noticed that a mosquito starts grey, and once it gets a few bites landed on you it turns visibly red, which means its blood sack is full.
Killing it after this point gives you a Mosquito Blood Sack.

That’s why it’s recommended to block their attacks until they fill, because killing them before they bite you often yields no blood sack.
Personally, I recommend aggroing a single mosquito, back off and block until it gets a blood bite or two so its sack turns red, then finish it off.
The Tiger Mosquitoes are essentially the same deal, just that they’re stronger than the normal variants.
That’s basically it. There’s no special quest, hidden cave, random chest or “rare spawn only at night.” You simply hunt mosquitoes until they’ve bitten you and drop the sack on death.

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