Can't help with the bumps (possibly oedema), but I wonder about sempervivum-you were told it will do well inside?
It will grow and look OK for a while, but in long run, they do best outdoors, they are very hardy plants.
They will not get enough light indoors. They will loose best color, their leaves will turn downwards. I believe they also benefit from winter dormancy.
Sure, most succulents will do best outdoors but we have to bring them/grow them inside since they are tender, but why would they advise you to grow hardy plant indoors...
(hardy to z3 or even z2)

It will do well in pot outside. Just give it well draining potting mix, and sun.
Rina

This post was edited by rina_ on Tue, Oct 21, 14 at 16:40

Thanks for your reply, Rina.

I live in Seattle. It rains at least three days a week so I don't think succulents would be well-suited to grow outside here. I could be wrong but if you think my echeveria has oedema from two waterings in a whole month, then I think our wet climate would make it a lot more miserable.

I suggested possibly oedema, but it could be something else on your echeveria.

Rest of my post was in relation to your sempervivum (even if you didn't ask-just because of advice you got). Sorry if I was out of line.
With so much rain, I guess steps have to be taken. You could grow it in container-outside, maybe in somewhat protected (from rain) location?
I have seen many photos of succulents grown in your area; lots, if not most, in containers. See this blog for example:
http://www.houstongardengirl.com/2011/08/succulents-of-seattle.html

I had to bring all of my plants into the breezeway few times when raining a lot, and we don't get as much rain as you. Not very convenient. They could be 'covered' too. That may not be very convenient either.

Rina

edited to add:
see this post by Howard of his protection against rain:
click here

This post was edited by rina_ on Tue, Oct 21, 14 at 18:59

I'm in western Oregon, and Sempervivums grow fantastically well outdoors all year here - in pots or in the ground. They are remarkable. Despite FIVE degrees one night last winter, continuous rain, and even a long snow with a deep freeze, my friend only lost a few rosettes from one pot out of her 3 or 4.

All hers are in very old, worn out soil, in wood or terracotta pots, which probably prevents drowning in the rain, but she doesn't do anything to them. They're like weeds. I think yours will probably be happy as long as you make sure the pot can drain all the rain.

Someone asked similar question on house plants forum, here is explanation by Al (tapla) about oedema:

http://forums2.gardenweb.com/forums/load/houseplt/msg1021161328262.html?4

Hope that may help some. Rina