Something's going on with Lindsay Lohan ... because healthy 26-year-olds don't bruise like this.
The shots were taken Tuesday in Venice, CA, while she was on a pre-rehab shopping spree with lil' sis Ali.
We've seen Lindsay bruised before ... but nothing like this. She had bruises at Coachella and in Brazil but these are definitely worse.
LiLo is telling friends she bruises easily because she doesn't drink enough water ... kind of a weird statement, because the only thing we see her drink publicly is H20.