<s>[INST] My 16 year old son was bitten three weeks ago on the bottom of his left foot by a water moccasin. He was treated with 5 vials of  Crofab and stayed in the hospital for six days. He seems to have recovered very well but says he has loss of feeling on the left side of his foot. Will the feeling loss be permanent of will the feeling gradually return over a period of time? If so, any idea how long a period of time? [/INST] Hello I have gone through your question and understand your concern. Post treatment with antivenin, temporary and/or permanent tissue and muscle damage can occur. Water moccasins venom is cytotoxic in nature therefore tissue of the affected area shows poor circulation and tissue regeneration is not possible on its own.If sensation does not return over a period of few weeks, it means no regeneration of tissue and the loss is permanent. Good luck. Hope your concern is answered. Thank you. </s>