Small patches that look like little blood blisters?

I've been getting these little blood blisters that come up just under my skin. They don't hurt and usually don't stay very long. Some are smaller that a pin head and others the size of maybe a tictac.

I've searched the internet using the only way I know to describe them,but have found nothing. Just wondering if maybe someone has experienced anything like this.

I have an appt with my doctor next month and it certainly isn't something to go in for early,mostly I'm curious.

I do take a medication that is hard on my kidneys,could it be related? It's not in the symptoms list.

Any hint or suggestion would be helpful and worth looking into if you have any ideas!! Thanks ;)