Causes of skin dryness

dry skin
is an uncomfortable condition marked by scaling
itching
burning sensation
cracking
Dry skin can develop on any part of your body. It’s most likely to affect your hands, arms, and legs.
In many cases, lifestyle changes and over-the-counter moisturizers may be all you need to treat it. .
Exposure to dry weather conditions, hot water, and certain chemicals can cause your skin to dry out. Dry skin can also result from underlying medical conditions like dermatits.
treatmet of dry skin :
avoid using hot water to shower
shower every other day instead of every day
keep your shower time to less than 10 minutes
use a moisturizing soap when you shower
apply moisturizer immediately after showering
pat, rather than rub, wet skin dry with a soft towel
avoid itching or scrubbing dry skin patches
use a humidifier in your home
drink plenty of water
you should followas these instruction and use moisturizer , if this fail , you should visit the dermatologist doctor to to examine you and giving a medical treatment regarding to your case