$user = $_SESSION['sess_user'];
$sql = mysql_query("SELECT points FROM accounts WHERE username='".$user."'");
$points = $sql;

<p>Welkom, <?=$_SESSION['sess_user'];?>! Dit is jouw Managerpaneel. Je hebt momenteel <?=$points?> Managerpunten.</p>

$sql = mysql_query("SELECT points FROM accounts WHERE username='".$user."'");
$row = mysql_fetch_assoc($sql);
$points = $row['points'];

$row = mysql_fetch_array($sql);
$points = $row['points'];