Police said they were called to Buckingham Road in Worthing at around 2.10pm to reports a man had been attacked.
A spokesperson for Sussex Police said: “It is reported the man had a liquid thrown at him, believed to have been acid. He was taken to hospital to be treated.
“Two people, a 37-year-old man and a 33-year-old woman both from Worthing, have been arrested on suspicion of wounding with intent.
“They have been bailed until January 23 pending further enquiries.
“It is believed they are all known to each other.”
A spokesperson for South East Coast Ambulance Service added: “We responded to an incident in Buckingham Road, Worthing at 2.13pm on Thursday with an ambulance.
“A 21 year old man was treated for a head wound and having an acid substance thrown in the face and taken to Worthing Hospital for further treatment.”
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