Thanks for choosing hcm forum.
Dryness of cheeks may be due to-xerostomia,diabetes,salivary gland
disorders,oral lesions like lichen planus
,oral submucous fibrosis
I would suggest you to get a thorough clinical evaluation done.
Salivary substitutes has to be administered.
Take plenty of fluids as well as nutritious diet including fruits and leafy vegetables to keep yourself nourished.
Maintain oral hygiene well.
Avoid anxiety and stress.
Take vitamin becosules as well as iron supplements
Hope this helps.