[Lordzy]

You mean like this?

pawn Код:

CMD:skin(playerid,params[])
{
   new skinid;
   if(sscanf(params,"i",skinid)) return SendClientMessage(playerid, 0xFF0000FF, "Usage: /skin [skin id]");
   if(skinid < 0 || skinid > 299) return SendClientMessage(playerid, 0xFF0000, "Invalid skin id");
   if(skinid == 165) return SendClientMessage(playerid, 0xFF0000FF, "You cannot use this skin"); //Here, it checks whether the skinid choosen is 165 or not.