An attack victim spat at a paramedic called out to help him, police said.
Officers are now hunting the man, who was taken to Blackpool Victoria Hospital but discharged himself without giving his details.
The incident happened between 3am and 4am on Wednesday, July 26, after ambulance crews were called to reports of an assault in the Queen Square area.
Police described the man as ‘uncooperative’, and said he spat in the paramedic’s face twice. They appealed for the public’s help in finding him this afternoon.
PC Jody Birchall, of Blackpool Police, said: “This was a particularly disgusting incident where a paramedic, just doing her job, has been spat on and assaulted.
“The victim was left shocked and upset and it is important we find the man responsible as soon as possible.
“Following extensive CCTV enquiries we are particularly keen to speak to this man in connection with the attack.
“If you recognise him, contact police immediately.”
Anyone with information can contact police on 101 quoting crime reference WA1713452.
Alternatively, independent charity Crimestoppers can be contacted on 0800 555111.