Depending on the blinds positioning system, i've seen situations when a player can miss either the small or the big blind alone or both. Pokerstars (and not only), due to it's forward button system, it allows for players to skip blinds the next hand if one of the blinds leaves.
Example of missing only the small blind: You play the big blind and sit out the next hand, therefore missing the small blind.
Example of missing only the big blind: You sit out in UTG position and miss the big blind the next hand. Then, the hand after, the small blind leaves allowing for the dealer button to jump over you therefore skipping the small blind instead of missing it.
Example of missing both blinds: You sit out in UTG position and wait for the dealer to pass over you before joining again.
My question is, in a three-handed game, if one of the players sits out what blinds will he/she miss and when? That is if he/she returns after other player(s) joins the game, otherwise he/she will be able to join only as the big blind, not posting any missing blinds.