The photos, supposedly taken early Thursday morning, showed Winehouse wearing blood-soaked ballet shoes, with bruises to her neck, bandages on her arms and makeup smeared down her face.
A gossip Web site reported that Winehouse had said her injuries were self-inflicted.
Police confirmed they had been called to an incident at a London hotel by a concerned member of the public but said no charges were filed.
Britain's Press Association said the couple were staying in the hotel after leaving a drug rehabilitation clinic in Essex, east of London.
The Daily Mail also published photos of Winehouse together with her husband, Blake Fielder-Civil, after the alleged fight. His face and neck were covered in scratches.
The gossip Web site perezhilton.com said it received text messages from Winehouse explaining the incident and denying Fielder-Civil was responsible for her injuries.
"Blake is the best man in the world. We would never ever harm each other," the Web site quoted Winehouse as saying. "I was cutting myself after he found me in our room about to do drugs ... and rightly said I wasn't good enough for him. I lost it and he saved my life."