Ring imprint on area below tip of glans

So I’ve started using a vacuum ADS, did only one set of 1 hour (Don’t know if I should go longer, I was kind of scared) but after taking off the ADS, I found a ring imprint around the glans below the tip. The area above the ring imprint seemed a bit rough and stiff when I squeezed it and it seemed to be a different shade darker. Should I be worried?

Is it still present?

No

I’ve started getting a mishapened glans (on the tip) (which goes back to normal after a while) which is stiff when I grab it while the area below is is normal. Should I be concerned with this as well?

I’ve been getting this as well. The few hours after using the ADS, there is an imprint where the silicone seal was as well as the deformed glans from the vacuum. I initially thought, “man I don’t know about this. I don’t want a fucked up looking dick. ” But the glans goes back to normal after the lymph fluid goes back to where it came from, and the imprint doesn’t appear to show up when a normal erection is present. At least that is my experience with it. I would say these issues are the least of the concerns with the vacuum ADS. Blisters in the glans being the worst. I’ve been getting them when using too much tension or too much time. Be careful and they seem to be effective.

Yeah I haven’t got a blister yet, I only do 1 hour of ADS stretching per day