Sussex Police said emergency services were called to the incident at around 8pm.
A police spokesperson said: “Police attended an address in Brimstone Road, Lancing.
“It followed a report of an altercation in Hayley Road, Lancing, at 6.45pm.
“A 21-year-old man sustained an injury to his hand, consistent with a stabbing, and attended hospital for treatment.
“This was an isolated incident that did not pose a wider threat to the community, and a 17-year-old boy was traced in connection with the incident.
“He was arrested on suspicion of causing grievous bodily harm and he remains in custody at this time.”

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Emergency services at the scene in Lancing. Picture: Sussex News and Pictures Photo: Sussex News and Pictures

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Emergency services at the scene in Lancing. Picture: Sussex News and Pictures Photo: Sussex News and Pictures

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Emergency services at the scene in Lancing. Picture: Sussex News and Pictures Photo: Sussex News and Pictures

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Emergency services at the scene in Lancing. Picture: Sussex News and Pictures Photo: Sussex News and Pictures

