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I can't answer about why you wouldn't normally bruise, but when people drink alcohol, the skin becomes flushed. This is because one of alcohol's effects is to open the arterioles that feed capillary beds on/near the skin. It's also why it's not a good idea to drink alcohol to warm yourself; you'll feel warmer because your skin is flushed (sort of the same reason why inflammation tends to feel hot, though there blood is 'leaking' from your vessels due to certain bioregulators), but you'll be losing heat more quickly in contact with cold environments. Your typical bruise comes from the capillary beds being damaged, thus if you are drinking and have more blood in your capillary beds, you'll be more likely to bruise.
For why you don't normally bruise? You might just have pretty efficient arterioles that close off the capillary beds. You might also have very osmotic interstitial fluid, which means your cells are at the same osmolarity, and would tend to 'suck up' the blood that would be otherwise 'lost' (as in, out of place in the area it's in) and distribute its contents. We'd have to experiment a little and see what happens under different circumstances. Try to bruise you when you are already hot (which will cause your skin capillary beds to open, again flushing the skin), see if different fluids with dye in them injected in certain areas will 'bruise' you, etc.
The skin becomes flushed for a different reason. It’s a sort of allergic reaction to the metabolism of alcohol that results in toxic acetaldehyde. Usually we have aldehyde dehydrogenase to rid the body of acetaldehyde but some people are lacking normal amounts of enzyme.