Hello and welcome to HCM
The lump and rough area on the inner aspect of the cheek needs to be examinaed.
Its exact characterization can be done by a biopsy
It is a procedure where is small bit of skin is taken and the condition of the epithelium & the underlying tissue is seen.
Such type of patches are seen in people who use tobaccoo especially chew it.
The irritation can also be caused by ill-fitting dentures.
So see if you have any of these predisposing factors.
If any of these are present, that cause should be removed and prevent further development of new such patches.
Thanks and take care
Dr Shailja P Wahal