Lindsay Lohan -- I'm Servicing the Community ... By Showing Off My Body

Lindsay Lohan's mosquito virus seems to be chikun-GONE-ya ... now she just needs to focus more on finishing her community service, and less on her ass -- or it could land her in jail.

Lilo posted a half naked pic Saturday afternoon on Instagram ... with a caption that almost mocks her own defense ... writing, "#mycalvins are helping me fight off chikungunya (kissy face emoji) hehe."

Lindsay is due in court next week to prove she's completed all her hours ... but she's nowhere near the finish line. LiLo's excuse is that the community service center in London was closed for 2 weeks during the holidays and she ended up in the hospital with chikungunya.