When you are writing a post there is a button on top of the box (a couple of inches above the text box) it reads "choose file" you click on that and then options for ways of posting a pic come up. First get your plant in something with drainage holes or drill a hole in your pot. It would really help to have a pic to see what type of soil you are growing with. Then we could assist you more.

To make sure it is scale, try to wipe them off with a cotton ball/q-tip moistened with rubbing alcohol (or even a tissue). Scale would come off easily, with just little pressure. If squished, there would be red 'goo' - blood. Otherwise it is not scale. In last photo, the tips are white (not brown). Could be just drying of the leave or it may be mealies. Is there any fluff? cottony-looking very fine webbing? See if it could be wiped off. Are they all potted in communal pot? Some have different watering needs. Btw, 6feet away from window is typically not enough light for most succulents. Rina

I'm completely ignorant about euphorbia but I thought the bump might get someone's attention, although weekends can be spotty around here. Unless someone here can offer advice, I suggest posting the photos on the Cacti and Succulents forum. It's very active, and there are a lot of extremely knowledgeable and helpful folks over there. Anyway, I just searched the site for "sunburn euphorbia" and it sounds like sunburn would show up as light colored or bleached looking spots or patches, but I'm concerned that the black areas around the light patches look like rot, which would have to be cut out before it spreads further. That's why you need advice from someone smarter than I am...

They need lots of sunlight. Maybe still not enough indoors. Any obstructions (trees or other vegetation, curtains...) will make light 'indirect'. I think that spots may have started as mechanical injury; but check 2 bigger ones if the leaves or spots themselves are soft. If there is a scab over, it should be OK. Otherwise, maybe even remove those leaves. Make sure the potting mix is thoroughly dry before every watering; use bamboo/wood chopstick or skewer or even pencil to test deep inside the pot. Bottom plant doesn't look that great - hopefully only because the protective powdery coating (often referred to as 'farina') seems to be rubbed off. Try handling the leaves as little as possible. Check the leaves if they are soft/limp - they should be quite turgid. IMO, it needs more light. If you have access to any outdoor space, they would benefit being there - but do not put them into sunlight suddenly or they will burn. Outside light is more intense and plants should be acclimatized. Can't tell for sure how low is the soil level in that pot, I like plants sitting higher so no leaves are really inside of the pot, if possible.