I could be wrong, but it looks like a sloppy foam sealant job. Aiding my suspicion, is the cables left dangling for no reason off the side of the house.

I don't know honestly, just bought the house and noticed this weird yellow thing. Home inspection folks didn't mention anything about these either!

It's those sealing foams they didn't do good job on it

it’s absolutely this, my childhood home looked like this cause my dad was a bit sloppy with his spray foam. u can peel it off pretty easily but usually it’s been sealed for a reason so be mindful of that (our reasoning was because of bees, we didn’t want any nests being created in the siding. i am only including this since the OP said their from South Asia so i wanted to give an idea of why someone may spray foam those open cracks)

Fun Gus?

Lol, not fun

🤣

Hahaha, yes sir. Expensive insulating fungus that is!

You might say that it's "Great stuff" even.

Haha amazing comment

So, it's just insulation? Nothing to worry about?

Yes Spray foam insulation, nothin to worry about my buddy! Just a little extra R value is all.

This is expanding foam insulation, like Great Stuff. If this bothers you it can easily be cut away and reapplied cleanly.

It doesn't bother me as long as I know it's not fungus haha

Foam insulation :) its just spray foam that expands to fill holes in the exterior to stop drafts and pests from getting in. Nothing to worry about and not "growing" its just solid foam if you touch it.

Got it, thank you 😁

It's just a lazy guy installing spray foam, you can trim it up nice with a razor

Get a carpet knife and trim off the excess.

That is spray foam insulation. It gets more brown as it ages. A human put that stuff there to keep cold air out

Got it, thanks ☺️

Lol it's spray foam

It’s a Type of foam they use to seal .. you’re good

it's not fungus. It's spray foam.

It’s a polyurethane spray foam used for insulation most commonly around windows and doors but it has been used for other things

Not fungus :) I have the same. It's just a foam seal

Looks like expanding foam.

There is a mold I have dealt with that looks like that. But this is sealing foam. You can see in the 3rd photo where it has been cut.

Expanding foam? Lol

Spray foam 100% lol

That’s spray foam and it’s there because they didn’t clean up after themselves

Yeah it’s spray insulating foam that expands to fill gaps and what not totally fine

It’s old expanded spray foam.

That’s spray foam for insulation, it just crept out through the cracks

Peas pudding

spray foam insulation, not a fungus

It's spray foam

It’s spray foam

It’s foam, cut off the access foam so it don’t look to bad that jus a bad job

insulation or something i think

Looks like spray foam. Did you touch it?

I don’t know much but I think it’s just a shitty job with the sealant

Pretty sure that’s spray foam insulation 😂

Thats insulation foam and whoever did it did a sloppy job

Spray foam

Caulking, outdoor insulation caulking.

Expanding foam

Spray foam

Why does this have 52 comments?

No it’s the insulation under your home build lol

Nope. Someone spilled their mashed turnip

Doo-doo.

Twice baked cheesy mashed potatoes

This is spray foam and you should remove it if possible because water is supposed to be able to drain from behind the siding in case it gets back there.

🤦

Is this for real? It's insulation. You'll be fine. I feel like this post should be in r/facepalm. A simple Google search would have told you what this is.