Odd sap discharge from small cactus

[sadhbh-rua]

Hi there, just wondering if this is normal. I got 5 small cacti impulsively at the hardeware store today (who can resist when they all have flower buds waiting to open!) and was trying to remove the fake paper flowers a few minutes ago.
It wasn't my best work, I can usually just trim the glue off but there was just too much and 4 out of five plants had some spines pulled out. Not a big deal, I'll repot them all in the next couple days.
As I was about to leave I noticed a thick sticky white sap started coming from where the spines used to be on one of the plants.
I've never seen this before so wondering if it's anything I should be concerned about?

Sorry about the poor photo quality, none of them have been ID'd yet

[iann]

Some Mammillarias have milky sap, which seems to be all this is.

[sadhbh-rua]

thank you, sorry if it was a silly question. ive had to take a few cuttings from damaged cacti ect before and all of them were very clear and watery inside so i was taken by surprise with this learn something new every day!

[greenknight]

Be sure to mention the milky sap if you post pictures for ID - that narrows it down quite a bit.

Pretty nice plants for a hardware store, even if they did have fake flowers glued on.

[hegar]

I agree with the fellows above: The milk-colored sap is the result of mechanical injury and some Mammillaria spp. "bleed" like that.
There is nothing to worry about.

Harald