Work on good nutrition
and drink at least 8 glasses
of water per day (not all at once but slowly all day).
Suggest you stop vasoline. Work on getting your skin wet with bath or shower and let your skin soak up the moisture, then AFTER your skin is wet, pat dry and apply good moisturizer lotion e.g. Eucerin, Nutragena or other. Key is to moisten skin with water, then apply lotion to hold in.