The former X Factor star was with her wife in Brighton when the incident occurred.
Two women have been arrested in connection with an attack on singer-songwriter Lucy Spraggan on Friday.
The star took to social media to show fans the injuries of her assault, while urging followers to “be safe”.
“Was attacked tonight after the show in Brighton, along with my guitarist and wife,” Lucy posted on Instagram.
“Sussex Police have been amazing and are pursuing a charge.
“Got a bit of whiplash and a few bruises but we’re all good. Scary shit, man. Be safe out there!”
In a statement about the attack, Lucy’s spokesperson added: “In the early hours of Friday morning Lucy was involved in an incident outside a bar on Middle Street, Brighton.
“She suffered cuts and bruises to the face and other injuries including bite lacerations.
“Lucy is recovering well and as planned will be fulfilling her European tour which starts in Amsterdam on Tuesday.
“Lucy has thanked Sussex Police for their help in the matter and their quick work in bringing two women into custody.
“No further comment is available at this stage.”
A 26-year-old and 27-year-old woman have been arrested on suspicion of assault and have been bailed to 15 April pending further enquiries.