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Ronda Rousey doesn't want anyone to see the damage Holly Holm did to her face -- taking drastic measures to cover up as she arrived back in L.A. moments ago.

Besides rocking a hood over her head, sunglasses on her eyes and draping her hair over her face ... Ronda also used a pillow to mask her mug as she walked through LAX.

Ronda's boyfriend Travis Browne was with her ... but neither Ronda nor Travis were in the mood to talk.

It's a pretty sad video ... Ronda like we've never seen her before.

As we previously reported, Dana White told us Ronda was depressed and bummed out about the loss -- but vows to return to the UFC for a rematch.